Matthew 3:11-12
I am baptizing you in water in token of your repentance, but he who is coming after me is stronger than I am, and I am not fit to carry his shoes. He will baptize you in the holy Spirit and in fire.
Mark 1:7-8
And this was his message: "After me there is coming one stronger than I am, one whose shoes I am not fit to stoop down and untie.
Luke 3:15-17
As all this aroused people's expectations, and they were all wondering in their hearts whether John was the Christ,
John 3:28-36
You will bear me witness that I said, 'I am not the Christ; I have been sent in advance of him.'