Abu Hurairah (May Allah be pleased with him) reported:
I heard Messenger of Allah (ﷺ) saying, "When Allah created the creatures, He wrote in the Book, which is with Him over His Throne: 'Verily, My Mercy prevailed over My Wrath"[Al-Bukhari and Muslim].Another narration is: Messenger of Allah (ﷺ) said, "(Allah wrote) 'My Mercy dominated My Wrath".Still another narration is: Messenger of Allah (ﷺ) said, "(Allah wrote) 'My Mercy surpasses My Wrath". (DE)
Arabic/English book reference (DE): Book 1, Hadith 419 (DE)