Sunan an-Nasa'i 571
سنن النسائي#571SahihIbn 'Umar said:"The Messenger of Allah (ﷺ) said: 'When the edge of the sun rises, then delay prayer until it has fully risen, and when the edge of the sun starts to set, delay prayer until it has fully set
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 ZaiSahih - Agreed Upon
In-book reference: 6:78