If we find someone who truly believes that Jesus is the Christ, he will preach this gospel to the world by devoting his live. Peter (Acts 4:10-12), Paul (Acts 19:8-10, 21, Rom 15:28) , Apollo (Act 18:24-28), Jesus explained evangelism through the parable of the sower. Jesus explained that just as a seed sowed in good soil will bear a hundred fold, so those who hear the word and understand it will reap a hundred fold.(Mt 13:8, 23)
Mt 13:8 But other fell into good ground, and brought forth fruit, some an hundredfold, some sixtyfold, some thirtyfold. 23 But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.
Peter forsook Jesus and denied Jesus until he truly believed that Jesus was the Christ. However, after meeting the resurrected Jesus and believing that Jesus is the Christ, he preached the gospel even before his death. (Acts 4:10-12)
Acts 4:10 Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even by him doth this man stand here before you whole. 11 This is the stone which was set at nought of you builders, which is become the head of the corner. 12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
At first, Paul was a persecutor of those who believed in Jesus. But when Paul met the resurrected Jesus, he realized that Jesus was the Christ. After that, Paul risked his life to tell the world that Jesus is the Christ. (Acts 19:8-10, 21, Rom 15:28)
Acts 19:8 And he went into the synagogue, and spake boldly for the space of three months, disputing and persuading the things concerning the kingdom of God. 9 But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus. 10 And this continued by the space of two years; so that all they which dwelt in Asia heard the word of the Lord Jesus, both Jews and Greeks. 21 After these things were ended, Paul purposed in the spirit, when he had passed through Macedonia and Achaia, to go to Jerusalem, saying, After I have been there, I must also see Rome.
Rom 15:28 When therefore I have performed this, and have sealed to them this fruit, I will come by you into Spain.
Apollos seems to have at first conveyed the teachings of Jesus. However, after he heard the gospel from Prisca and his wife that Jesus was the Christ, he boldly told the Jews that Jesus was the Christ. (Acts 18:27-28)
Acts 18:24 And a certain Jew named Apollos, born at Alexandria, an eloquent man, and mighty in the scriptures, came to Ephesus. 25 This man was instructed in the way of the Lord; and being fervent in the spirit, he spake and taught diligently the things of the Lord, knowing only the baptism of John. 26 And he began to speak boldly in the synagogue: whom when Aquila and Priscilla had heard, they took him unto them, and expounded unto him the way of God more perfectly. 27 And when he was disposed to pass into Achaia, the brethren wrote, exhorting the disciples to receive him: who, when he was come, helped them much which had believed through grace: 28 For he mightily convinced the Jews, and that publicly, shewing by the scriptures that Jesus was Christ.