'O son of Adam, so long as you call upon Me and put your hope in Me, I will forgive you for what you have done, and I shall not mind. O son of Adam, if your sins were to reach the clouds of the sky, and you were to ask me for forgiveness, I will forgive you and I shall not mind. O son of Adam, if you were to come to Me with sins nearly the size of the earth, and you were to meet Me not associating anything with Me, then I would bring you forgiveness nearly the size of (the earth) .''
(Reported by al-Tirmidhi; Saheeh al-Jaami',4338) .
(Saying of the Prophet Mohammad peace be upon him)