John 1:20

he own'd it, and did not deny it; but made this protestation, I am not the Christ.

Matthew 3:11-12

I indeed baptize you with water to lead you to repentance; but he that cometh after me, is my superiour, whose shoes I am not worthy to carry: he shall baptize you with the effusion of the holy Ghost, in the appearance of fire:

Mark 1:7-8

among other things he said, there comes one after me, who is superiour to me, I am not worthy to stoop down and untie his shoes.

Luke 3:15-17

As the people were in suspence, every man imagining in his own mind that John might be the Messiah;

John 3:28-36

you yourselves can bear me witness, that I said, I am not the Christ, but was only sent before him:

Treasury of Scripture Knowledge

Summary

And he confessed, and denied not; but confessed, I am not the Christ.

Bible References

General references

John 3:28
you yourselves can bear me witness, that I said, I am not the Christ, but was only sent before him:
Matthew 3:11
I indeed baptize you with water to lead you to repentance; but he that cometh after me, is my superiour, whose shoes I am not worthy to carry: he shall baptize you with the effusion of the holy Ghost, in the appearance of fire:
Mark 1:7
among other things he said, there comes one after me, who is superiour to me, I am not worthy to stoop down and untie his shoes.
Luke 3:15
As the people were in suspence, every man imagining in his own mind that John might be the Messiah;