Hadeeth Qudsi 33:

On the authority of AbuHurayrah (may Allah be pleased with him) that the Prophet ,from among the things he reports from his Lord (mighty and sublime beHe), is that he said:

A servant [of Allah’s] committed asin and said: O Allah, forgive me my sin. And He (glorified and exaltedbe He) said: My servant has committed a sin and has known that he has aLord who forgives sins and punishes for them. Then he sinned again andsaid: O Lord, forgive me my sin. And He (glorified and exalted be He)said: My servant has committed a sin and has known that he has a Lordwho forgives sins and punishes for them. Then he sinned again and said:O Lord, forgive me my sin. And He (glorified and exalted be He) said:My servant has committed a sin and has known that he has a Lord whoforgives sins and punishes for sins. Do what you wish, for I haveforgiven you.

It was related by Muslim (alsoby al-Bukhari).