´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 Referenceسنن ابن ماجه / كتاب إقامة الصلاة والسنة / 886
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:إسناده حسن