'Bear Witness' in the Bible

(For the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us;)

And we have beheld and bear witness that the Father hath sent the Son to be the Saviour of the world.

For they that bear witness are three:

And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.