Sunan an-Nasa'i 1115
سنن النسائي#1115SahihIt was narrated that Ibn 'Abbas said:"The Prophet (ﷺ) was commanded to prostrate on seven bones and was forbidden to tuck up his hair and garment
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: 12:87