‘Abdallah b. ‘Umar told that a man came to the Prophet and said, “Messenger of God, how often shall I forgive a servant?” He gave no reply, so the man repeated what he had said, but he still kept silence. When he asked a third time he replied, “Forgive him (The verb is in the plural) seventy times daily.”
Abu Dawud transmitted it, but Tirmidhi transmitted it from 'Abdallah b. ‘Amr.