Abdullah bin Umar (may Allah be pleased with him) said that a man came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, my slave behaves very badly and does wrong. He (peace and blessings be upon him) said: "Forgive him seventy (70) times a day."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15798