Mark 1:3
A voice of one crying in the wilderness, Prepare the way of the Lord! Make his paths straight.
Matthew 3:3
For this is he that was spoken of by Isaiah the prophet, saying; A voice of one crying in the wilderness, Prepare the way of the Lord, make his paths straight.
Luke 3:4-6
as it is written in the book of the words of Isaiah the prophet; A voice of one crying in the wilderness, prepare the way of the Lord, make his paths straight.
John 1:15
John testified of him, and cried, saying, This is the one of whom I said, He that comes after me existed before me, for he was before me.
John 3:28-36
You yourselves bear me witness, that I said, I am not the Christ, but am sent before him.
John 1:19-34
AND this is the testimony of John, when the Jews from Jerusalem sent priests and Levites to ask him, Who are you?