4 John was in the desert, baptizing and preaching the baptism of penance, unto remission of sins.
Mark 1:4 Cross References - DouayRheims
Matthew 3:1-2
Matthew 3:6
6 And were baptized by him in the Jordan, confessing their sins.
Matthew 3:11
11 I indeed baptize you in water unto penance, but he that shall come after me, is mightier than I, whose shoes I am not worthy to bear: he shall baptize you in the Holy Ghost and fire.
Luke 1:77
77 To give knowledge of salvation to his people, unto the remission of their sins.
Luke 3:2-3
John 3:23
23 And John also was baptizing in Ennon near Salim: because there was much water there. And they came and were baptized.
Acts 10:37
37 You know the word which hath been published through all Judea: for it began from Galilee, after the baptism which John preached.
Acts 13:24-25
Acts 19:3-4
Acts 22:16
16 And now why tarriest thou? Rise up and be baptized and wash away thy sins, invoking his name.