Sunan Ibn Majah 699
سنن ابن ماجه#699SahihIt was narrated from Abu Hurairah that:The Messenger of Allah said: "Whoever catches one Rak'ah of the 'Asr before the sun sets, then he has caught it, and whoever catches one Rak'ah of the Subh before the sun rises, then he has caught it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 2:33