حَدَّثَنَا وَكِيعٌ حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ عَنْ شُعْبَةَ مَوْلَى ابْنِ عَبَّاسٍ عَنِ ابْنِ عَبَّاسٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا سَجَدَ يُرَى بَيَاضُ إِبْطَيْهِ
مسند امام احمد بن حنبل · Hadith 2073
It was narrated from Ibn 'Abbas that when the Prophet (PBUH) prostrate, the whiteness of his armpits could be seen.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020