Sahih al-Bukhari · Hadith 7554

Oneness, Uniqueness of Allah (Tawheed)

Narrated Abu Hurairah (ra): I heard Allah's Messenger (ﷺ) saying: "Before Allah created the creations, He wrote a Book (wherein He has written): "My Mercy has preceded my Anger.' And that is written with Him over the Throne." (see Hadith)