Jami` at-Tirmidhi 2156
جامع الترمذي#2156SahihAbdullah bin 'Amr narrated that the Messenger of Allah (s.a.w) said:"Allah decreed the measures fifty-thousand years before He created the Heavens and the earth
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 32:24