Jami` at-Tirmidhi 351
جامع الترمذي#351SahihJabir narrated:"The Prophet dispatched me for something he needed. I came to him while he was performing Salat on his mount, heading east, he made the prostrations lower than the bowing
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
In-book reference: 2:203