John 1:7

He came to be a witness, so that he might testify concerning that Light, so that all people would believe [in Jesus] through him [i.e., through his testimony. See Acts 19:4].

John 1:19

And this is the testimony John [the Immerser] gave when the Jews sent priests and Levites from Jerusalem to ask him, "Who are you?" [Note: Levites were men who assisted the priests in the Temple service].

Acts 19:4

Paul [then] said, "John immersed people who [demonstrated their] repentance, telling them they must believe in Jesus, the One who would come after him."

John 1:9

[Now] the true Light, who enlightens all mankind, was [indeed] coming into the world [i.e., to earth].

John 1:12

But He gave all those who did welcome Him the opportunity of becoming children of God by believing in His name [i.e., as the Messiah].

John 1:15

John gave testimony about Jesus, shouting out, "This person is the one about whom I said, 'He who will come after me ranks above me because He existed before me.'"

John 1:26-27

So, John answered them, saying, "I am immersing people in water, but there is Someone among you whom you do not recognize.

John 1:32-34

So, John gave his testimony, saying, "I have seen the Holy Spirit descending as a dove out of heaven, and it remained on Him.

John 1:36

And when he saw Jesus walking by, he said, "Look, [there is] the Lamb of God!"

John 3:26-36

These disciples went to John and said to him, "Rabbi, look, that man who was with you on the east side of the Jordan River [i.e., Jesus], whom you testified about, is immersing people and everyone is going to him." [Note: Actually, it was Jesus' disciples who did the immersing. See 4:2].

John 5:33-35

"You people have sent to John [the Immerser, for information. See 1:19] and he has given true testimony [about me].

Ephesians 3:9

[I was given the responsibility] to enlighten all people regarding the working out of God's secret plan, which has been kept hidden for ages in [the heart of] God, who created everything.

1 Timothy 2:4

who wants all people to be saved and come to a [full] knowledge of the truth.

Titus 2:11

For God's unearned favor has appeared, bringing salvation to all people [i.e., in the coming of Christ].

2 Peter 3:9

The Lord is not slow about keeping His promise, like some people are, but is [simply] being patient with you, since He does not want anyone to be destroyed, but He wants everyone to repent [i.e., change their hearts and lives].

Treasury of Scripture Knowledge

Summary

The same came for a witness, to bear witness of the Light, that all men through him might believe.

General references

Bible References

A witness

John 1:19
And this is the testimony John [the Immerser] gave when the Jews sent priests and Levites from Jerusalem to ask him, "Who are you?" [Note: Levites were men who assisted the priests in the Temple service].
John 3:26
These disciples went to John and said to him, "Rabbi, look, that man who was with you on the east side of the Jordan River [i.e., Jesus], whom you testified about, is immersing people and everyone is going to him." [Note: Actually, it was Jesus' disciples who did the immersing. See 4:2].
John 5:33
"You people have sent to John [the Immerser, for information. See 1:19] and he has given true testimony [about me].
Acts 19:4
Paul [then] said, "John immersed people who [demonstrated their] repentance, telling them they must believe in Jesus, the One who would come after him."

That

John 1:9
[Now] the true Light, who enlightens all mankind, was [indeed] coming into the world [i.e., to earth].
John 3:26
These disciples went to John and said to him, "Rabbi, look, that man who was with you on the east side of the Jordan River [i.e., Jesus], whom you testified about, is immersing people and everyone is going to him." [Note: Actually, it was Jesus' disciples who did the immersing. See 4:2].
Ephesians 3:9
[I was given the responsibility] to enlighten all people regarding the working out of God's secret plan, which has been kept hidden for ages in [the heart of] God, who created everything.
1 Timothy 2:4
who wants all people to be saved and come to a [full] knowledge of the truth.
Titus 2:11
For God's unearned favor has appeared, bringing salvation to all people [i.e., in the coming of Christ].
2 Peter 3:9
The Lord is not slow about keeping His promise, like some people are, but is [simply] being patient with you, since He does not want anyone to be destroyed, but He wants everyone to repent [i.e., change their hearts and lives].

General references

Mark 11:30
Was the immersion of John [authorized] from heaven or from men? Give me an answer."
Acts 13:24
His coming occurred after John [the Immerser] had preached to Israel that those who repented should be immersed [as evidence that they had done so].