New Living Translation
This messenger was John the Baptist. He was in the wilderness and preached that people should be baptized to show that they had repented of their sins and turned to God to be forgiven.

American Standard Version
John came, who baptized in the wilderness and preached the baptism of repentance unto remission of sins.

Berean Study Bible
John the Baptist appeared in the wilderness, preaching a baptism of repentance for the forgiveness of sins.

Douay-Rheims Bible
John was in the desert baptizing, and preaching the baptism of penance, unto remission of sins.

English Revised Version
John came, who baptized in the wilderness and preached the baptism of repentance unto remission of sins.

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

World English Bible
John came baptizing in the wilderness and preaching the baptism of repentance for forgiveness of sins.

Young's Literal Translation
John came baptizing in the wilderness, and proclaiming a baptism of reformation -- to remission of sins,

Mark 1:4 Additional Translations ...