John 1:7

this man came for witness, that he might testify concerning the light, that through him all might believe.

John 1:19

And this is the testimony of John, when the Jews sent from Jerusalem priests and Levites to ask him, Who art thou?

Acts 19:4

Then said Paul, John indeed baptized with the baptism of repentance, telling the people, that they should believe in Him that was coming after him, that is, in Christ Jesus.

John 1:9

The true light was that which enlightneth every man that cometh into the world.

John 1:12

But as many as received Him, to them granted He the privilege to become the children of God, even to them that believe on his name;

John 1:15

Of Him did John bare witness, and publicly declared, saying, This was He of whom I spake, He that cometh after me is preferred before me; for He was before me.

John 1:26-27

John answered them, saying, I baptize with water: but there standeth one among you, whom ye know not;

John 1:32-34

And John testified saying, I saw the Spirit descending like a dove from heaven, and it abode upon Him.

John 1:36

and looking upon Jesus as He was walking, he saith, "Behold the lamb of God."

John 3:26-36

And they came to John, and said unto him, Rabbi, He that was with thee on the other side Jordan, to whom thou barest testimony, behold, He baptizeth and all the people come to Him.

John 5:33-35

Ye your selves sent unto John, and he bore witness to the truth:

Ephesians 3:9

and make all men to see the communication of the mystery, which from the ages past hath been hid in God, who created all things by Jesus Christ;

1 Timothy 2:4

who is willing that all men should be saved, and therefore come to the knowledge of the truth.

Titus 2:11

For the grace of God, that bringeth salvation, hath appeared to all men;

2 Peter 3:9

The Lord is not slow as to his promise (as some count it slowness) but is long-suffering towards us, not willing that any should perish, but that all should come to repentance.

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 of John, when the Jews sent from Jerusalem priests and Levites to ask him, Who art thou?
John 3:26
And they came to John, and said unto him, Rabbi, He that was with thee on the other side Jordan, to whom thou barest testimony, behold, He baptizeth and all the people come to Him.
John 5:33
Ye your selves sent unto John, and he bore witness to the truth:
Acts 19:4
Then said Paul, John indeed baptized with the baptism of repentance, telling the people, that they should believe in Him that was coming after him, that is, in Christ Jesus.

That

John 1:9
The true light was that which enlightneth every man that cometh into the world.
John 3:26
And they came to John, and said unto him, Rabbi, He that was with thee on the other side Jordan, to whom thou barest testimony, behold, He baptizeth and all the people come to Him.
Ephesians 3:9
and make all men to see the communication of the mystery, which from the ages past hath been hid in God, who created all things by Jesus Christ;
1 Timothy 2:4
who is willing that all men should be saved, and therefore come to the knowledge of the truth.
Titus 2:11
For the grace of God, that bringeth salvation, hath appeared to all men;
2 Peter 3:9
The Lord is not slow as to his promise (as some count it slowness) but is long-suffering towards us, not willing that any should perish, but that all should come to repentance.

General references

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