A.T. Robertson Commentary Matthew 18:21

"Then came Peter and said to him, Lord, how oft shall my brother sin against me, and I forgive him? until seven times?" — Matthew 18:21 (ASV)

Until seven times? (εως επτακισ?) Peter thought that he was generous as the Jewish rule was three times (Amos 1:6). His question goes back to verse 15. "Against me" is genuine here. "The man who asks such a question does not really know what forgiveness means" (Plummer).