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.
nasai-kubra:699ʿAlī b. Ḥujr > Ismāʿīl > Dāwud > ʿUbaydullāh b. ʿAbdullāh b. Aqram from his father

"I prayed with the Messenger of Allah ﷺ and I used to see the whiteness of his armpits when he prostrated." (Using translation from Nasāʾī 1108)  

الكبرى للنسائي:٦٩٩أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ حَدَّثَنَا إِسْمَاعِيلُ قَالَ حَدَّثَنَا دَاوُدُ عَنْ عُبَيْدِ اللهِ بْنِ عَبْدِ اللهِ بْنِ أَقْرَمَ عَنْ أَبِيهِ قَالَ

«صَلَّيْتُ مَعَ رَسُولِ اللهِ ﷺ فَكُنْتُ أَرَى عُفْرَةَ إِبِطِهِ إِذَا سَجَدَ»  


See similar narrations below:

Collected by Nasāʾī
nasai:1108ʿAlī b. Ḥujr > Ismāʿīl > Dāwud b. Qays > ʿUbaydullāh b. ʿAbdullāh b. Aqram from his father

"I prayed with the Messenger of Allah ﷺ and I used to see the whiteness of his armpits when he prostrated."  

النسائي:١١٠٨أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ أَنْبَأَنَا إِسْمَاعِيلُ قَالَ حَدَّثَنَا دَاوُدُ بْنُ قَيْسٍ عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ أَقْرَمَ عَنْ أَبِيهِ قَالَ

صَلَّيْتُ مَعَ رَسُولِ اللَّهِ ﷺ فَكُنْتُ أَرَى عُفْرَةَ إِبْطَيْهِ إِذَا سَجَدَ