عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ: رَأَيْتُ بَيَاضَ كَشْحِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ وَهُوَ سَاجِدٌ
Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) says: I saw the whiteness of the side of the Messenger of Allah (peace and blessings be upon him) when he was in prostration.