Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:420-527b – Ibn ʿAbbās > Āstadbart
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السيوطي:٤٢٠-٥٢٧b –

"عَنِ ابْن عَبَّاسٍ قَالَ: اسْتَدْبَرْتُ النَّبىَّ ﷺ وَهُوَ سَاجِدٌ - فَرَأَيْتُ بَيَاضَ إِبِطَيْهِ".  

[كر] ابن عساكر في تاريخه

See similar narrations below:

Collected by Aḥmad
ahmad:2662 – Ḥusayn > Abū Wakīʿ > Abū Isḥāq > al-Tamīmī > Ibn ʿAbbās

[Machine] I contemplated the Messenger of Allah ﷺ and I saw the whiteness of his armpits while he was in prostration.  

أحمد:٢٦٦٢ – حَدَّثَنَا حُسَيْنٌ حَدَّثَنَا أَبُو وَكِيعٍ عَنْ أَبِي إِسْحَاقَ عَنِ التَّمِيمِيِّ عَنِ ابْنِ عَبَّاسٍ قَالَ

اسْتَدْبَرْتُ رَسُولَ اللهِ ﷺ فَرَأَيْتُ بَيَاضَ إِبْطَيْهِ وَهُوَ سَاجِدٌ  

ahmad:2908 – Aswad > Isrāʾīl > Abū Isḥāq > al-Tamīmiyyiʿan Ibn ʿAbbās

[Machine] I contemplated the Messenger of Allah ﷺ and I saw him prostrating, his armpits were visible in white.  

أحمد:٢٩٠٨ – حَدَّثَنَا أَسْوَدُ حَدَّثَنَا إِسْرَائِيلُ عَنْ أَبِي إِسْحَاقَ عَنِ التَّمِيمِيِّعَنِ ابْنِ عَبَّاسٍ قَالَ

تَدَبَّرْتُ رَسُولَ اللهِ ﷺ فَرَأَيْتُهُ سَاجِدًا مُخَوِّيًا وَرَأَيْتُ بَيَاضَ إِبْطَيْهِ