Luke 17:3-4

3Pay attention and always be on guard [looking out for one another]! If your brother sins and disregards God’s precepts, solemnly warn him; and if he repents and changes, forgive him.

4Even if he sins against you seven times a day, and returns to you seven times and says, ‘I repent,’ you must forgive him [that is, give up resentment and consider the offense recalled and annulled].”