One of the two who heard John, and followed him, was Andrew, Simon Peter's brother.
And they then said unto him, Who are you? that we may give an answer to those who have sent us. What do you say of yourself? And he said, I am the voice of one crying in the wilderness, Make straight the way of the Lord, as was predicted by Isaiah the prophet. And they which were sent were of the Pharisees. And they asked him, and said unto him, Why do you baptize then, if you are not the Messiah, or Elijah, or the Prophet? And John answered them, saying, I baptize with water: but there is standing one among you, whom you do not know; He it is, whose coming after me is preferred before me, whose shoe latchet I'm not worthy to untie. These things were done in Bethabara beyond Jordan, where John was baptizing. And the next day John saw Jesus coming unto him, and he said, Behold the Lamb of God, that taketh away the sin of the world! ( John 1:22-29 )