Luke 1:2 just as they were handed down to us by those who from the beginning were eyewitnesses and servants of the word,

Luke 24:48 "You are witnesses of these things.

John 19:35 And he who has seen has testified, and his testimony is true; and he knows that he is telling the truth, so that you also may believe.

John 21:24 This is the disciple who is testifying to these things and wrote these things, and we know that his testimony is true.

1 John 1:2 and the life was manifested, and we have seen and testify and proclaim to you the eternal life, which was with the Father and was manifested to us--

1 John 4:14 We have seen and testify that the Father has sent the Son to be the Savior of the world. (NASB ©1995)