Mark 1:4

John was immersing in the wilderness, and preaching the immersion of repentance in order to the remission of sins.

Luke 1:77

by giving to his people the knowledge of salvation in the remission of their sins,

Matthew 3:1-2

In those days came John the Immerser, preaching in the wilderness of Judea,

Matthew 3:6

and were immersed by him in the Jordan, confessing their sins.

Matthew 3:11

I immerse you in water, in order to repentance; but he that comes after me is mightier than I, whose sandals I am not worthy to carry. He will immerse you in the Holy Spirit and in fire:

Luke 3:2-3

Annas and Caiaphas being chief priests, the word of God came to John the son of Zachariah, in the wilderness.

John 3:23

And John also was immersing in Aenon, near Salim, because there was much water there. And they came and were immersed;

Acts 10:37

that word, you know, which was published through the whole of Judea, beginning from Galilee, after the immersion that John preached;

Acts 13:24-25

John having first preached, before his coming, the immersion of repentance to all the people of Israel.

Acts 19:3-4

And he said to them: Into what, then, were you immersed? They replied: Into John's immersion.

Acts 22:16

And now, why do you delay? Arise, and be immersed, and wash away your sins, calling on the name of the Lord.

Treasury of Scripture Knowledge

Summary

John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins.

Remission

Bible References

Did

Matthew 3:1
In those days came John the Immerser, preaching in the wilderness of Judea,
Luke 3:2
Annas and Caiaphas being chief priests, the word of God came to John the son of Zachariah, in the wilderness.
John 3:23
And John also was immersing in Aenon, near Salim, because there was much water there. And they came and were immersed;
Acts 10:37
that word, you know, which was published through the whole of Judea, beginning from Galilee, after the immersion that John preached;
Acts 13:24
John having first preached, before his coming, the immersion of repentance to all the people of Israel.
Acts 19:3
And he said to them: Into what, then, were you immersed? They replied: Into John's immersion.

Remission

Acts 22:16
And now, why do you delay? Arise, and be immersed, and wash away your sins, calling on the name of the Lord.