John 1:21-23

21They asked him, “What then? Are you Elijah?” And he said, “I am not.” “Are you the [promised] Prophet?” And he answered, “No.”

22Then 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?”

23He said, “I am the voice of one shouting in the wilderness, ‘Make straight the way of the Lord,’ as the prophet Isaiah said.”