Sayyiduna Abdullah bin Malik bin Buhaina (may Allah be pleased with him) narrates that when the Noble Prophet (peace and blessings be upon him) performed prayer, he would create such a gap between his arms that the whiteness of both his armpits would become visible.
Hadith Referenceاللؤلؤ والمرجان / كتاب الصلاة / 277
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 8 كتاب الصلاة: 27 باب يبدي ضَبْعيه ويجافي في السجود»