The wife of the Messenger, Sayyida Maymunah (may Allah be pleased with her), says: When the Messenger of Allah (peace and blessings be upon him) performed prostration, he would spread (his arms) so much that whoever was behind him could see the whiteness of his armpits.
Hadith Referenceالفتح الربانی / أبواب صفة الصلاة / 1729
Hadith Gradingمحدثین:أخرجه مسلم: 497
Hadith Takhrij«أخرجه مسلم: 497 ، (انظر مسند أحمد ترقيم الرسالة: 26818 ترقیم بيت الأفكار الدولية: 27368»