On the authority of Anas (may Allah be pleased with him), who said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) Saying: "Allah the Almighty has said: O son of Adam, So long as you call upon Me and ask of Me, I shall forgive you for what you have done, and I shall not mind. O son of Adam, were your sins to reach the clouds of the sky and were you then to ask forgiveness of Me, I would forgive you. O son of Adam, Were you to come to Me with sins nearly as great as the earth and were you then to face Me, believing in Me, and not associating anybody with Me, I would bring you forgiveness nearly as great as the earth is."

(Tirmidhi)