Sunan an-Nasa'i 515
سنن النسائي#515SahihIt was narrated from Abu Hurairah that the Prophet (ﷺ) said:"Whoever catches up with one Rak'ah of 'Asr prayer before the sun sets, or catches up with one Rak'ah of Fajr before the sun rises, has caught it
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: 6:22