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".

وعن أبي هريرة، رضي الله عنه ، قال: قال رسول الله ، ﷺ لما خلق الله الخلق، كتب في كتاب، فهو عنده فوق العرش: إن رحمتي تغلب غضبي".
((متفق عليه))