Oneness, Uniqueness of Allah (Tawheed)
حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، حَدَّثَنَا أَبُو الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِنَّ اللَّهَ لَمَّا قَضَى الْخَلْقَ كَتَبَ عِنْدَهُ فَوْقَ عَرْشِهِ إِنَّ رَحْمَتِي سَبَقَتْ غَضَبِي ".Narrated Abu Huraira:The Prophet (ﷺ) said, "When Allah had finished His creation, He wrote over his Throne: 'My Mercy preceded My Anger
From Sahih al-Bukhari, whose reports the scholars accept as authentic.