John 21:24-25

This is the disciple who testifies to these things and who wrote them down. We know that his testimony is true. Jesus did many other things as well. If every one of them were written down, I suppose that even the whole world would not have room for the books that would be written.

This is the disciple who testifies to these things 
John 15:26-27  "When the Advocate comes, whom I will send to you from the Father--the Spirit of truth who goes out from the Father--he will testify about me. And you also must testify, for you have been with me from the beginning."
Luke 24:48  "You are witnesses of these things."
Acts 1:8  "But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth."
Acts 2:32  "God has raised Jesus to life, and we are all witnesses of it."
Acts 4:20  "As for us, we cannot help speaking about what we have seen and heard." 
Acts 5:32  "We are witnesses of these things, and so is the Holy Spirit, whom God has given to those who obey him." 
Acts 13:30-31  "But God raised him from the dead, and for many days he was seen by those who had traveled with him from Galilee to Jerusalem. They are now his witnesses to our people."
1 Peter 5:1  To the elders among you, I appeal as a fellow elder and a witness of Christ's sufferings who also will share in the glory to be revealed: ... 
1 John 1:1-2  That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked at and our hands have touched--this we proclaim concerning the Word of life. The life appeared; we have seen it and testify to it, and we proclaim to you the eternal life, which was with the Father and has appeared to us. 
1 John 4:14  And we have seen and testify that the Father has sent his Son to be the Savior of the world.

Scriptures taken from the Holy Bible, New International Version® NIV®, 
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