John 1:20
And he confessed--and he did not deny, and confessed--"I am not the Christ!"
Matthew 3:11-12
I baptize you with water for repentance, but the one who comes after me is more powerful than I [am], whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit and fire.
Mark 1:7-8
And he was preaching, saying, "One [who is] more powerful than I is coming after me, of whom I am not worthy to bend down [and] untie the strap of his sandals.
Luke 3:15-17
And [while] the people were waiting expectantly and all were pondering in their hearts concerning John, whether perhaps he might be the Christ,
John 3:28-36
You yourselves testify about me that I said, 'I am not the Christ, but I am sent before that one.'