Sunan an-Nasa'i 521
سنن النسائي#521SahihIt was narrated that Abu Basrah Al-Ghifari said:"The Messenger of Allah (ﷺ) led us in praying 'Asr in Al-Mukhammas. He said: 'This prayer was enjoined upon those who came before you, but they neglected it. Whoever prays it regularly will have a two-fold reward, and there is no prayer after it until the Shahid appears." And the Shahid is "the star." [1] [1] This is a statement of one of the narrators, and Allah knows best
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 Muslim
In-book reference: 6:28