Sunan an-Nasa'i 1292
سنن النسائي#1292SahihIt was narrated that Musa bin Talha said:"I asked Zaid bin Kharijah who said: 'I asked the Messenger of Allah (ﷺ) and he said: Send salah upon me and strive hard in supplication, and say: Alahumma salli 'ala Muhammad wa 'ala ali Muhammad (O Allah, send salah upon Muhammad and upon the family of Muhammad)
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 ZaiIsnaad Hasan
In-book reference: 13:114