John 1:8

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

John 1:20

and he confessed, and did not deny, - and he confessed - I, am not, the Christ;

John 3:28

Ye yourselves, unto me, bear witness, that, I, said - I, am not the Christ; but - I am sent before, That One.

Acts 19:4

Then said Paul - John, immersed with an immersion of repentance, unto the people, saying, that, on him who was coming after him, they should believe, - that is, on 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 did not deny, - and he confessed - I, am not, the Christ;
John 3:28
Ye yourselves, unto me, bear witness, that, I, said - I, am not the Christ; but - I am sent before, That One.
Acts 19:4
Then said Paul - John, immersed with an immersion of repentance, unto the people, saying, that, on him who was coming after him, they should believe, - that is, on Jesus.

General references

Mark 11:30
The immersion by John, Of heaven, was it, or, of men? Answer me!
Acts 13:24
John, beforehand proclaiming, before the face of his coming in, an immersion of repentance, unto all the people of Israel.