Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) says: I saw the whiteness of the side of the Messenger of Allah (peace and blessings be upon him) when he was in prostration.
Hadith Referenceالفتح الربانی / أبواب صفة الصلاة / 1725
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«حديث صحيح لغيره ، (انظر مسند أحمد ترقيم الرسالة: 11113 ترقیم بيت الأفكار الدولية: 11129»
Brief Explanation
Benefits: … That is, due to keeping the arms away from the stomach, the whiteness of the armpit became visible.