Sahih al-Bukhari 7553
Sahih al-Bukhari · Book 97: Oneness, Uniqueness of Allah (Tawheed) · “Nay! This is a Glorious Qur'an, in Al-Lauh Al-Mahfuz.
Narrated Abu Huraira:
وَقَالَ لِي خَلِيفَةُ بْنُ خَيَّاطٍ حَدَّثَنَا مُعْتَمِرٌ ، سَمِعْتُ أَبِي ، عَنْ قَتَادَةَ ، عَنْ أَبِي رَافِعٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لَمَّا قَضَى اللَّهُ الْخَلْقَ كَتَبَ كِتَابًا عِنْدَهُ غَلَبَتْ ـ أَوْ قَالَ سَبَقَتْ ـ رَحْمَتِي غَضَبِي. فَهْوَ عِنْدَهُ فَوْقَ الْعَرْشِ " .
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 (Book) is written with Him over the Throne."