John 1:8

He was not that light: but to bear witness of the light.

John 1:20

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

John 3:28

Ye yourselves are witnesses, how that I said, 'I am not Christ: but am sent before him.'

Acts 19:4

Then said Paul, "John verily baptised with the baptism of repentance, saying unto the people that they should believe on him, which should come after him. That is on Christ Jesus."

Treasury of Scripture Knowledge

Summary

He was not that Light, but was sent to bear witness of that Light.

General references

Bible References

That light

John 1:20
And he confessed, and denied not, and said plainly, "I am not Christ."
John 3:28
Ye yourselves are witnesses, how that I said, 'I am not Christ: but am sent before him.'
Acts 19:4
Then said Paul, "John verily baptised with the baptism of repentance, saying unto the people that they should believe on him, which should come after him. That is on Christ Jesus."

General references

Mark 11:30
The baptism of John: was it from heaven, or of men? Answer me."
Acts 13:24
when John had first preached before his coming the baptism of repentance to Israel.