John 1:8

He was not the light, but came that he might bear witness concerning the light.

John 1:20

Who art thou? and he confessed and denied not, and confessed that, I am not the Christ.

John 3:28

You are witnessing to me, that I said, I am not the Christ, but that I am sent before Him.

Acts 19:4

And Paul said, John baptized with the baptism of repentance, saying unto the people, that they should believe on the one coming after him, that is 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
Who art thou? and he confessed and denied not, and confessed that, I am not the Christ.
John 3:28
You are witnessing to me, that I said, I am not the Christ, but that I am sent before Him.
Acts 19:4
And Paul said, John baptized with the baptism of repentance, saying unto the people, that they should believe on the one coming after him, that is Jesus.

General references

Mark 11:30
Was the baptism of John from heaven, or from men? answer me.
Acts 13:24
and John having preached the baptism of repentance to all the people of Israel, before the face of his coming.