Matthew 28:18] And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
Acts.1: But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Often called the Great Commission. The summation of the gospel of Matthew being the message of salvation should be taken to all nations. Though not fully heeded until the calling of the Apostle Paul to the Gentiles. Knowing those scattered after Pentecost preached only to the Jews. The gospel was finally preached and received en masse to the Gentiles at Antioch where the name Christian became the name for those who had believed. It was from the church at Antioch Paul and Barnabas was sent out to the world to preach the gospel.
Acts.11: Now they which were scattered abroad upon the persecution that arose about Stephen travelled as far as Phenice, and Cyprus, and Antioch, preaching the word to none but unto the Jews only.
 And some of them were men of Cyprus and Cyrene, which, when they were come to Antioch, spake unto the Grecians, preaching the Lord Jesus.
 And the hand of the Lord was with them: and a great number believed, and turned unto the Lord.
 Then tidings of these things came unto the ears of the church which was in Jerusalem: and they sent forth Barnabas, that he should go as far as Antioch.
 Who, when he came, and had seen the grace of God, was glad, and exhorted them all, that with purpose of heart they would cleave unto the Lord.
 For he was a good man, and full of the Holy Ghost and of faith: and much people was added unto the Lord.
 Then departed Barnabas to Tarsus, for to seek Saul:
 And when he had found him, he brought him unto Antioch. And it came to pass, that a whole year they assembled themselves with the church, and taught much people. And the disciples were called Christians first in Antioch.
 And in these days came prophets from Jerusalem unto Antioch.
 And there stood up one of them named Agabus, and signified by the spirit that there should be great dearth throughout all the world: which came to pass in the days of Claudius Caesar.
 Then the disciples, every man according to his ability, determined to send relief unto the brethren which dwelt in Judaea:
 Which also they did, and sent it to the elders by the hands of Barnabas and Saul.
Acts 12: And Barnabas and Saul returned from Jerusalem, when they had fulfilled their ministry, and took with them John, whose surname was Mark.
Acts.13: Now there were in the church that was at Antioch certain prophets and teachers; as Barnabas, and Simeon that was called Niger, and Lucius of Cyrene, and Manaen, which had been brought up with Herod the tetrarch, and Saul.
 As they ministered to the Lord, and fasted, the Holy Ghost said, Separate me Barnabas and Saul for the work whereunto I have called them.
 And when they had fasted and prayed, and laid their hands on them, they sent them away.
 So they, being sent forth by the Holy Ghost, departed unto Seleucia; and from thence they sailed to Cyprus.
 And when they were at Salamis, they preached the word of God in the synagogues of the Jews: and they had also John to their minister.
In about the year 45 AD , some 10-15 years away from the Resurrection Barnabas and Paul were sent from the church at Antioch to preach the gospel.
(verse 3) It is noteworthy they laid their hands on them. Are we to suppose the Apostle Paul was lacking in the power of the Holy Ghost or perhaps Barnabas a prophet or teacher was ? Of course not, the laying on the hands was symbolic of the authority of the body of believers at Antioch being bestowed upon them as representatives first of the Lord but also of the church. As it is to this day missionaries are authorized and sent by a local body of believers to the world. The missionaries function is to convert the lost .
(Verse five) Also noteworthy they first went to the Jews preaching the message of the grace of God.
(Romans 1: For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.)
Returned to their home church
After completion of their first journey they returned to the church at Antioch to give a report of their ministry. Even as it is today the missionary spends time in the field preaching the word and teaching then returns to the church for a refreshing and report to the body of the work.
Acts 14: And when they had preached the word in Perga, they went down into Attalia:
 And thence sailed to Antioch, from whence they had been recommended to the grace of God for the work which they fulfilled.
 And when they were come, and had gathered the church together, they rehearsed all that God had done with them, and how he had opened the door of faith unto the Gentiles.
 And there they abode long time with the disciples.
Acts 15: Paul also and Barnabas continued in Antioch, teaching and preaching the word of the Lord, with many others also.
 And some days after Paul said unto Barnabas, Let us go again and visit our brethren in every city where we have preached the word of the Lord, and see how they do.
 And Barnabas determined to take with them John, whose surname was Mark.
 But Paul thought not good to take him with them, who departed from them from Pamphylia, and went not with them to the work.
 And the contention was so sharp between them, that they departed asunder one from the other: and so Barnabas took Mark, and sailed unto Cyprus;
 And Paul chose Silas, and departed, being recommended by the brethren unto the grace of God.
 And he went through Syria and Cilicia, confirming the churches.
After some time at their home church they returned to the field. Though after some disagreement they went their separate ways.
After Paul’s second journey he again returned to his home church.
Acts 18: And when he had landed at Caesarea, and gone up, and saluted the church, he went down to Antioch.
 And after he had spent some time there, he departed, and went over all the country of Galatia and Phrygia in order, strengthening all the disciples.
Giving to missions.
We find scattered throughout the church epistles references to giving to the work of the Lord. As the gospel spread and churches were began having been taught by the Apostle Paul they began giving to the ministry of Paul. So it is today. Missionaries though sent from a “home” church are supported by others bodies of believers of like faith.
Philippians 4: Now ye Philippians know also, that in the beginning of the gospel, when I departed from Macedonia, no church communicated with me as concerning giving and receiving, but ye only.
 For even in Thessalonica ye sent once and again unto my necessity.
 Not because I desire a gift: but I desire fruit that may abound to your account.
2Corinthians 8: Moreover, brethren, we do you to wit of the grace of God bestowed on the churches of Macedonia;
 How that in a great trial of affliction the abundance of their joy and their deep poverty abounded unto the riches of their liberality.
 For to their power, I bear record, yea, and beyond their power they were willing of themselves;
 Praying us with much intreaty that we would receive the gift, and take upon us the fellowship of the ministering to the saints.
 And this they did, not as we hoped, but first gave their own selves to the Lord, and unto us by the will of God.
 Insomuch that we desired Titus, that as he had begun, so he would also finish in you the same grace also.
 Therefore, as ye abound in every thing, in faith, and utterance, and knowledge, and in all diligence, and in your love to us, see that ye abound in this grace also.
 I speak not by commandment, but by occasion of the forwardness of others, and to prove the sincerity of your love.
 For ye know the grace of our Lord Jesus Christ, that, though he was rich, yet for your sakes he became poor, that ye through his poverty might be rich.
 And herein I give my advice: for this is expedient for you, who have begun before, not only to do, but also to be forward a year ago.
 Now therefore perform the doing of it; that as there was a readiness to will, so there may be a performance also out of that which ye have.
 For if there be first a willing mind, it is accepted according to that a man hath, and not according to that he hath not.
 For I mean not that other men be eased, and ye burdened:
 But by an equality, that now at this time your abundance may be a supply for their want, that their abundance also may be a supply for your want: that there may be equality:
 As it is written, He that had gathered much had nothing over; and he that had gathered little had no lack.
 But thanks be to God, which put the same earnest care into the heart of Titus for you.
 For indeed he accepted the exhortation; but being more forward, of his own accord he went unto you.
 And we have sent with him the brother, whose praise is in the gospel throughout all the churches;
 And not that only, but who was also chosen of the churches to travel with us with this grace, which is administered by us to the glory of the same Lord, and declaration of your ready mind:
 Avoiding this, that no man should blame us in this abundance which is administered by us:
 Providing for honest things, not only in the sight of the Lord, but also in the sight of men.
 And we have sent with them our brother, whom we have oftentimes proved diligent in many things, but now much more diligent, upon the great confidence which I have in you.
 Whether any do inquire of Titus, he is my partner and fellowhelper concerning you: or our brethren be inquired of, they are the messengers of the churches, and the glory of Christ.
 Wherefore shew ye to them, and before the churches, the proof of your love, and of our boasting on your behalf.
2Corinthians 9: For as touching the ministering to the saints, it is superfluous for me to write to you:
 For I know the forwardness of your mind, for which I boast of you to them of Macedonia, that Achaia was ready a year ago; and your zeal hath provoked very many.
 Yet have I sent the brethren, lest our boasting of you should be in vain in this behalf; that, as I said, ye may be ready:
 Lest haply if they of Macedonia come with me, and find you unprepared, we (that we say not, ye) should be ashamed in this same confident boasting.
 Therefore I thought it necessary to exhort the brethren, that they would go before unto you, and make up beforehand your bounty, whereof ye had notice before, that the same might be ready, as a matter of bounty, and not as of covetousness.
 But this I say, He which soweth sparingly shall reap also sparingly; and he which soweth bountifully shall reap also bountifully.
 Every man according as he purposeth in his heart, so let him give; not grudgingly, or of necessity: for God loveth a cheerful giver.
 And God is able to make all grace abound toward you; that ye, always having all sufficiency in all things, may abound to every good work:
 (As it is written, He hath dispersed abroad; he hath given to the poor: his righteousness remaineth for ever.
 Now he that ministereth seed to the sower both minister bread for your food, and multiply your seed sown, and increase the fruits of your righteousness;)
 Being enriched in every thing to all bountifulness, which causeth through us thanksgiving to God.
 For the administration of this service not only supplieth the want of the saints, but is abundant also by many thanksgivings unto God;
 Whiles by the experiment of this ministration they glorify God for your professed subjection unto the gospel of Christ, and for your liberal distribution unto them, and unto all men;
 And by their prayer for you, which long after you for the exceeding grace of God in you.
 Thanks be unto God for his unspeakable gift.
Though we as individual Christians might never walk a foreign field with the gospel we can through or local church have a part in the salvation and conversion of people around the world through our missionaries. (Phil. 4:17)