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The correct expression is Repent of.
The suffix to "repent" is "-ance".
There are versions of the word repent and mention of the word repent in the Old Testament. The actual word, repent, was not mentioned until Matthew chapter 4. Repent was the first command the Jesus gave.
The Greek word for repent is μετανοώ
The adjective for "repent" is "repentant".