In those days John the Baptist came preaching in the wilderness of Judea,
and saying, "Repent, for the kingdom of heaven is at hand!"
For this is he who was spoken of by the prophet Isaiah, saying: "The voice of one crying in the wilderness: 'Prepare the way of the Lord; Make His paths straight.' "
References for Matthew 3:3
And John himself was clothed in camel's hair, with a leather belt around his waist; and his food was locusts and wild honey.
Then Jerusalem, all Judea, and all the region around the Jordan went out to him
and were baptized by him in the Jordan, confessing their sins.