Sunan an-Nasa'i 957
سنن النسائي#957SahihIt was narrated from Ibn Abbas that:The Prophet (ﷺ) prostrated in Sad and said: "Dawud did this prostration in repentance and we do it in thanksgiving
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 Sahih
In-book reference: 11:82