John 1:20

And he confessed, and denied not, and said plainly, "I am not Christ."

Matthew 3:11-12

I baptise you in water in token of repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptise you with the holy ghost and with fire:

Mark 1:7-8

and preached, saying, "A stronger than I cometh after me, whose shoe latchet I am not worthy to stoop down and unloose.

Luke 3:15-17

As the people were in a doubt, and all men disputed in their hearts of John: Whether he were very Christ;

John 3:28-36

Ye yourselves are witnesses, how that I said, 'I am not Christ: but am 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
Ye yourselves are witnesses, how that I said, 'I am not Christ: but am sent before him.'
Matthew 3:11
I baptise you in water in token of repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptise you with the holy ghost and with fire:
Mark 1:7
and preached, saying, "A stronger than I cometh after me, whose shoe latchet I am not worthy to stoop down and unloose.
Luke 3:15
As the people were in a doubt, and all men disputed in their hearts of John: Whether he were very Christ;