´Ahmar, the Companion of the Messenger of Allah (ﷺ), narrated to us:` “We used to feel sorry for the Messenger of Allah (ﷺ) because he took pains to keep his arms away from his sides when he prostrated.”
Hadith ReferenceSunan Ibn Majah / Establishing the Prayer and the Sunnah Regarding Them / Hadith: 886
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:إسناده حسن