Sahih Muslim 6749
صحيح مسلم#6749SahihAbdullah b. 'Amr b. al-'As reported:I heard Allah's Messenger (ﷺ) as saying: Allah ordained the measures (of quality) of the creation fifty thousand years before He created the heavens and the earth, as His Throne was upon water
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 46:27