Christians, we have to be both an example and an evangelist. One without the other makes our witness incomplete. Bro. Jeff explains here.
1 Thessalonians 1:8 KJV
8 For from you sounded out the word of the Lord not only in Macedonia and Achaia, but also in every place your faith to God-ward is spread abroad; so that we need not to speak any thing.
1 Thessalonians 2:1-4
1 For yourselves, brethren, know our entrance in unto you, that it was not in vain: 2 But even after that we had suffered before, and were shamefully entreated, as ye know, at Philippi, we were bold in our God to speak unto you the gospel of God with much contention. 3 For our exhortation [was] not of deceit, nor of uncleanness, nor in guile: 4 But as we were allowed of God to be put in trust with the gospel, even so we speak; not as pleasing men, but God, which trieth our hearts.
1 Now when they had passed through Amphipolis and Apollonia, they came to Thessalonica, where was a synagogue of the Jews: 2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures, 3 Opening and alleging, that Christ must needs have suffered, and risen again from the dead; and that this Jesus, whom I preach unto you, is Christ. 4 And some of them believed, and consorted with Paul and Silas; and of the devout Greeks a great multitude, and of the chief women not a few.
Acts 9:19-22, 28-30
19 And when he had received meat, he was strengthened. Then was Saul certain days with the disciples which were at Damascus. 20 And straightway he preached Christ in the synagogues, that he is the Son of God. 21 But all that heard [him] were amazed, and said; Is not this he that destroyed them which called on this name in Jerusalem, and came hither for that intent, that he might bring them bound unto the chief priests? 22 But Saul increased the more in strength, and confounded the Jews which dwelt at Damascus, proving that this is very Christ. … 28 And he was with them coming in and going out at Jerusalem. 29 And he spake boldly in the name of the Lord Jesus, and disputed against the Grecians: but they went about to slay him. 30 [Which] when the brethren knew, they brought him down to Caesarea, and sent him forth to Tarsus.
6 Now when they had gone throughout Phrygia and the region of Galatia, and were forbidden of the Holy Ghost to preach the word in Asia, 7 After they were come to Mysia, they assayed to go into Bithynia: but the Spirit suffered them not. 8 And they passing by Mysia came down to Troas. 9 And a vision appeared to Paul in the night; There stood a man of Macedonia, and prayed him, saying, Come over into Macedonia, and help us. 10 And after he had seen the vision, immediately we endeavoured to go into Macedonia, assuredly gathering that the Lord had called us for to preach the gospel unto them.
30 And Paul dwelt two whole years in his own hired house, and received all that came in unto him, 31 Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ, with all confidence, no man forbidding him.
14 I am debtor both to the Greeks, and to the Barbarians; both to the wise, and to the unwise. 15 So, as much as in me is, I am ready to preach the gospel to you that are at Rome also. 16 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.
1 Corinthians 9:16-23
16 For though I preach the gospel, I have nothing to glory of: for necessity is laid upon me; yea, woe is unto me, if I preach not the gospel! 17 For if I do this thing willingly, I have a reward: but if against my will, a dispensation [of the gospel] is committed unto me. 18 What is my reward then? [Verily] that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel. 19 For though I be free from all [men], yet have I made myself servant unto all, that I might gain the more. 20 And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law; 21 To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law. 22 To the weak became I as weak, that I might gain the weak: I am made all things to all [men], that I might by all means save some. 23 And this I do for the gospel’s sake, that I might be partaker thereof with [you].
2 Corinthians 5:20
20 Now then we are ambassadors for Christ, as though God did beseech [you] by us: we pray [you] in Christ’s stead, be ye reconciled to God.
27 Only let your conversation be as it becometh the gospel of Christ: that whether I come and see you, or else be absent, I may hear of your affairs, that ye stand fast in one spirit, with one mind striving together for the faith of the gospel;
2 Timothy 4:1-2
1 I charge [thee] therefore before God, and the Lord Jesus Christ, who shall judge the quick and the dead at his appearing and his kingdom; 2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. 19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: 20 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.
15 And he said unto them, Go ye into all the world, and preach the gospel to every creature.
8 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.
8 And Stephen, full of faith and power, did great wonders and miracles among the people. 9 Then there arose certain of the synagogue, which is called [the synagogue] of the Libertines, and Cyrenians, and Alexandrians, and of them of Cilicia and of Asia, disputing with Stephen. 10 And they were not able to resist the wisdom and the spirit by which he spake. 11 Then they suborned men, which said, We have heard him speak blasphemous words against Moses, and [against] God. 12 And they stirred up the people, and the elders, and the scribes, and came upon [him], and caught him, and brought [him] to the council, 13 And set up false witnesses, which said, This man ceaseth not to speak blasphemous words against this holy place, and the law: 14 For we have heard him say, that this Jesus of Nazareth shall destroy this place, and shall change the customs which Moses delivered us. 15 And all that sat in the council, looking stedfastly on him, saw his face as it had been the face of an angel.
Acts 7:1-2, 54-58
1 Then said the high priest, Are these things so? 2 And he said, Men, brethren, and fathers, hearken; The God of glory appeared unto our father Abraham, when he was in Mesopotamia, before he dwelt in Charran, … 54 When they heard these things, they were cut to the heart, and they gnashed on him with [their] teeth. 55 But he, being full of the Holy Ghost, looked up stedfastly into heaven, and saw the glory of God, and Jesus standing on the right hand of God, 56 And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God. 57 Then they cried out with a loud voice, and stopped their ears, and ran upon him with one accord, 58 And cast [him] out of the city, and stoned [him]: and the witnesses laid down their clothes at a young man’s feet, whose name was Saul.
Acts 8:5-8, 26-39
5 Then Philip went down to the city of Samaria, and preached Christ unto them. 6 And the people with one accord gave heed unto those things which Philip spake, hearing and seeing the miracles which he did. 7 For unclean spirits, crying with loud voice, came out of many that were possessed [with them]: and many taken with palsies, and that were lame, were healed. 8 And there was great joy in that city. … 26 And the angel of the Lord spake unto Philip, saying, Arise, and go toward the south unto the way that goeth down from Jerusalem unto Gaza, which is desert. 27 And he arose and went: and, behold, a man of Ethiopia, an eunuch of great authority under Candace queen of the Ethiopians, who had the charge of all her treasure, and had come to Jerusalem for to worship, 28 Was returning, and sitting in his chariot read Esaias the prophet. 29 Then the Spirit said unto Philip, Go near, and join thyself to this chariot. 30 And Philip ran thither to [him], and heard him read the prophet Esaias, and said, Understandest thou what thou readest? 31 And he said, How can I, except some man should guide me? And he desired Philip that he would come up and sit with him. 32 The place of the scripture which he read was this, He was led as a sheep to the slaughter; and like a lamb dumb before his shearer, so opened he not his mouth: 33 In his humiliation his judgment was taken away: and who shall declare his generation? for his life is taken from the earth. 34 And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man? 35 Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus. 36 And as they went on [their] way, they came unto a certain water: and the eunuch said, See, [here is] water; what doth hinder me to be baptized? 37 And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God. 38 And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him. 39 And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing.