When Allah created the creation, He wrote in a book, which is with Him over the Throne: Verily, My mercy predominates over My anger
Authentic hadithعن أبي هريرة رضي الله عنه مرفوعاً: «لما خلق اللهُ الخَلْقَ كتب في كتاب، فهو عنده فوق العرش: إن رحمتي تَغْلِبُ غضبي». وفي رواية: «غَلَبَتْ غضبي» وفي رواية: «سَبَقَتْ غضبي».
Abu Hurayrah (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) said: "When Allah created the creation, He wrote in a book, which is with Him over the Throne: Verily, My mercy predominates over My anger." Another narration: "My mercy predominated My anger.'' Another narration: "My mercy preceded My anger.''
Explanation
When Allah created the creation, He wrote in a book, which is with Him over the Throne: Verily, My mercy predominates over My anger. In the Qur'an, He says: {And My mercy encompasses all things.} Indeed, this prompts Muslims not to despair or lose hope.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).