Hadeeth Qudsi 1:

On the authority of AbuHurayrah (may Allah be pleased with him), who said that the Messengerof Allah  said:

When Allah decreed the Creation Hepledged Himself by writing in His book which is laid down with Him: Mymercy prevails over my wrath.

It was related by Muslim (alsoby al-Bukhari, an-Nasa’i and Ibn Majah).