Mark 1:4

John came baptizing in the wilderness, and preaching a baptism of repentance for the forgiveness of sins.

Luke 1:77

to give knowledge of salvation to his people in the forgiveness of their sins,

Matthew 3:1-2

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

Matthew 3:6

and confessing their sins, they were baptized by him in the Jordan River.

Matthew 3:11

I baptize you with water for repentance, but he who is coming after me is mightier than I, whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit and fire.

Luke 3:2-3

during the high priesthood of Annas and Caiaphas, the word of God came to John son of Zechariah in the wilderness.

John 3:23

Now John also was baptizing at Aenon near Salim, because there was much water there; and people came and were baptized.

Acts 10:37

You know what has happened throughout all Judea, beginning from Galilee after the baptism which John preached:

Acts 13:24-25

Before his coming John had preached a baptism of repentance to all the people of Israel.

Acts 19:3-4

And he said, "Into what then were you baptized?" They said, "Into John's baptism."

Acts 22:16

Now why do you delay? Get up and be baptized, and wash away your sins, calling on his name.'

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 John the Baptist came, preaching in the wilderness of Judea,
Luke 3:2
during the high priesthood of Annas and Caiaphas, the word of God came to John son of Zechariah in the wilderness.
John 3:23
Now John also was baptizing at Aenon near Salim, because there was much water there; and people came and were baptized.
Acts 10:37
You know what has happened throughout all Judea, beginning from Galilee after the baptism which John preached:
Acts 13:24
Before his coming John had preached a baptism of repentance to all the people of Israel.
Acts 19:3
And he said, "Into what then were you baptized?" They said, "Into John's baptism."

Remission

Acts 22:16
Now why do you delay? Get up and be baptized, and wash away your sins, calling on his name.'