‘Abdallah b. Malik Ibn Buhaina* said that when the Prophet prostrated himself he spread out his arms so that the whiteness under his armpits was visible. * Buhaina was ‘Abdallah’s mother. (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 891
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (390) و مسلم (235 / 495)»