Jami` at-Tirmidhi 273
جامع الترمذي#273SahihIbn Abbas narrated:"The Prophet ordered that one prostrate on seven bones and that he not gather his hair nor his garment
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 2:125