Mark 1:4

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

Luke 1:77

And to give knowledge of salvation unto his people, for the remission of sins:

Matthew 3:1-2

In those days John the Baptist came, and preached in the wilderness of Jewry,

Matthew 3:6

and were baptised of him in Jordan, confessing their sins.

Matthew 3:11

I baptise you in water in token of repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptise you with the holy ghost and with fire:

Luke 3:2-3

When Annas and Caiaphas were the high priests: The word of God came unto John, the son of Zacharias, in the wilderness.

John 3:23

and John also baptised in Enon, besides Salim, because there was much water there, and they came, and were baptised.

Acts 10:37

which preaching was published throughout all Jewry, and began in Galilee, after the baptism preached by John;

Acts 13:24-25

when John had first preached before his coming the baptism of repentance to Israel.

Acts 19:3-4

And he said unto them, "Wherewith were ye then baptised?" And they said, "With John's baptism."

Acts 22:16

And now: why tarriest thou? Arise and be baptised, and wash away thy sins, in 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 John the Baptist came, and preached in the wilderness of Jewry,
Luke 3:2
When Annas and Caiaphas were the high priests: The word of God came unto John, the son of Zacharias, in the wilderness.
John 3:23
and John also baptised in Enon, besides Salim, because there was much water there, and they came, and were baptised.
Acts 10:37
which preaching was published throughout all Jewry, and began in Galilee, after the baptism preached by John;
Acts 13:24
when John had first preached before his coming the baptism of repentance to Israel.
Acts 19:3
And he said unto them, "Wherewith were ye then baptised?" And they said, "With John's baptism."

Remission

Acts 22:16
And now: why tarriest thou? Arise and be baptised, and wash away thy sins, in calling on the name of the Lord.'