That phrase does not appear in Scripture. The closest thing that you will find is the description, in Luke and Matthew of the baptisms of John the Baptist as a Baptism of Repentance, not unlike the phrase a Baptism of fire.
"Ant He said unto them, go ye into all the world, and preach the gospel to every creature, He that Believeth and IS BAPTIZED SHALL BE SAVED." Mark 16:15,16.
"Then Peter said unto them, Repent, and BE BAPTIZED everyone of you in the name of Jesus Christ FOR THE REMISSION OF SINS, and ye shall receive the gift of the Holy Ghost." (Acts 2:38).
Your point was BAPTISM for remission of sins. Our point was The BLOOD OF CHRIST for the remission of sins. Just in case you forgot what you were arguing about..