Sunan an-Nasa'i 558
سنن النسائي#558SahihIt was narrated from Salim that the Messenger of Allah (ﷺ) said:"Whoever catches up with a Rak'ah of one of the prayers has caught up with it, except that he has to make up the portion that he missed
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Lighairihi
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 6:65