Sunan an-Nasa'i 1441
سنن النسائي#1441SahihIt was narrated that Ibn 'Abbas said:"The prayer of the resident was enjoined on the tongue of your Prophet (ﷺ), four (rak'ahs), and the prayer of the traveler is two rak'ahs, and the prayer of fear is one rak'ah
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
In-book reference: 15:9