Sunan an-Nasa'i 573
سنن النسائي#573SahihIt was narrated that 'Ali said:"The Messenger of Allah (ﷺ)forbade praying after 'Asr unless the sun was still white, clear and high
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 6:80