John 1:26-27, 29

John answered them, saying, I baptize with water: but there standeth one among you, whom ye know not; he it is, who coming after me is preferred before me, whose shoe's latchet I am not worthy to unloose.

The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.