Witnesses of Jesus Christ
Moses bore witness to Jesus Christ
He said that a prophet is coming after him and he should be listened to (Deuteronomy 18:15 and 18). Jesus confirmed that Moses spoke about him (John 5:45-47, NKJV).
John the Baptist bore witness to Jesus Christ
John the Baptist who was sent "to make straight the way of the LORD" (John 1:23, NKJV) said that Jesus is "the Lamb of God who takes away the sin from the world" (John 1:29, NKJV).
God bears witness to Jesus
Jesus said that according to the law the testimony of two men is true, so God bears witness to Jesus and Jesus bears witness to himself (John 8:16-18, NKJV). Jesus says that the Father is with him so his judgment is true (John 8:16, NKJV). God testified that Jesus Christ is his beloved son when he was water baptised and the Spirit came down on him as a dove, and also when Jesus was transfigured. (Matthew 3:17 and 17:5, NKJV).
For He received from God the Father honor and glory when such a voice came to Him from the Excellent Glory: "This is My beloved Son, in whom I am well pleased." (2 Peter 1:17, NKJV).
The works that Jesus did
The miracles and healings performed by Jesus testify that God sent him (John 5:36, NKJV).