كتاب الصلاة
4  
Prayer
(15a)
Chapter: Prostration and its Excellence - Section 1
(14)
باب السجود وفضله - الفصل الأول
Mishkat al-Masabih 891
‘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.)
وَعَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ بن بُحَيْنَة قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا سَجَدَ فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاض إبطَيْهِ
  مُتَّفَقٌ عَلَيْهِ   (الألباني) حكم   :
Reference : Mishkat al-Masabih 891
In-book reference : Book 4, Hadith 315