Mt 16:16-17, Jn 4:29,42, Jn 20:27-28
In the Old Testament, King Manasseh was defeated by the Assyrian army and became a captive. King Manasseh prayed to God and was released from captivity and became king again. Only then did King Manasseh know that the Lord was the true God. (2 Chronicles 33:10-13)
2 Chronicles 33:10 And the Lord spake to Manasseh, and to his people: but they would not hearken. 11 Wherefore the Lord brought upon them the captains of the host of the king of Assyria, which took Manasseh among the thorns, and bound him with fetters, and carried him to Babylon. 12 And when he was in affliction, he besought the Lord his God, and humbled himself greatly before the God of his fathers, 13 And prayed unto him: and he was intreated of him, and heard his supplication, and brought him again to Jerusalem into his kingdom. Then Manasseh knew that the Lord he was God.
By the grace of God, Peter came to know that Jesus was the Christ. (Mt 16:16-17)
Mt 16:16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God. 17 And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.
People living in Suga City heard the words of Jesus and came to know that Jesus was the Christ. (John 4:29, 42)
John 4:29 Come, see a man, which told me all things that ever I did: is not this the Christ? 42 And said unto the woman, Now we believe, not because of thy saying: for we have heard him ourselves, and know that this is indeed the Christ, the Saviour of the world.
Thomas put his hand on the side of the resurrected Jesus and knew that Jesus was the Christ. (John 20:27-28)
John 20:27 Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing. 28 And Thomas answered and said unto him, My Lord and my God.