وَعَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ بن بُحَيْنَة
قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا سَجَدَ فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاض إبطَيْهِ
Abdallah ibn Malik Ibn Buhaina* said that when the Prophet (sallallahu alayhi wa sallam) prostrated himself he spread out his arms so that the whiteness under his armpits was visible. * Buhaina was Abdallah’s mother.