Interestingly, forget is almost never used in combination with sin. But often the Bible does say that God will “not remember” our sins. The idea of “remembering sins” takes the idea of acting according to memory and puts it into a negative framework. It suggests that God is going to give the person what he or she deserves for the sin. He will punish sin, not just keep it on his mind. Consider: They have gone deep in depravity As in the days of Gibeah; He will remember their iniquity, He will punish their sins. (Hos. 9:9 NASB)
