John the Baptist preached the baptism of what?

ANSWER

Repentance for the remission of sins

Mark 1 :

(4) And so John the Baptist appeared in the wilderness, preaching a baptism of repentance for the forgiveness of sins. (5) The whole Judean countryside and all the people of Jerusalem went out to him. Confessing their sins, they were baptized by him in the Jordan River.
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