John 1:7, 19-23, 35-37

This man came as a witness, to testify about the Light, so that all might believe [in Christ, the Light] through him.

This is the testimony of John [the Baptist] when the Jews sent priests and Levites to him from Jerusalem to ask him, “Who are you?” And he confessed [truthfully] and did not deny [that he was only a man], but acknowledged, “I am not the Christ (the Messiah, the Anointed)!” They asked him, “What then? Are you Elijah?” And he said, “I am not.” “Are you the [promised] Prophet?” And he answered, “No.” [Deut 18:15, 18; Mal 4:5] Then they said to him, “Who are you? Tell us, so that we may give an answer to those who sent us. What do you say about yourself?” He said, “I am THE VOICE OF ONE SHOUTING IN THE WILDERNESS, ‘MAKE STRAIGHT THE WAY OF THE LORD,’ as the prophet Isaiah said.” [Is 40:3]

Again the next day John was standing with two of his disciples, and he looked at Jesus as He walked along, and said, “Look! The Lamb of God!” The two disciples heard him say this, and they followed Jesus.