Acts 26:20

but, [instead] declared to the people of Damascus first, [then] to the people of Jerusalem, and [finally to those] throughout all of the district of Judea, as well as to the Gentiles [everywhere] that they should repent [i.e., change their hearts and lives] and turn to God, doing deeds which demonstrate their repentance.

James 4:8-9

Come close to God and He will come close to you. Wash your hands, you sinful people [i.e., this is an exhortation to repent of moral and spiritual corruption], and purify your hearts, you double-minded people.

Treasury of Scripture Knowledge

Summary

Therefore also now, saith the LORD, turn ye even to me with all your heart, and with fasting, and with weeping, and with mourning:

With fasting

Bible References

With fasting

James 4:8
Come close to God and He will come close to you. Wash your hands, you sinful people [i.e., this is an exhortation to repent of moral and spiritual corruption], and purify your hearts, you double-minded people.