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.
bukhari:807Yaḥyá b. Bukayr > Bakr b. Muḍar > Jaʿfar > Ibn Hurmuz > ʿAbdullāh b. Mālik Ibn Buḥaynah

Whenever the Prophet ﷺ used to offer prayer he used to keep arms away (from the body) so that the whiteness of his armpits was visible.  

البخاري:٨٠٧حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ قَالَ حَدَّثَنِي بَكْرُ بْنُ مُضَرَ عَنْ جَعْفَرٍ عَنِ ابْنِ هُرْمُزَ عَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ ابْنِ بُحَيْنَةَ

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا صَلَّى فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاضُ إِبْطَيْهِ وَقَالَ اللَّيْثُ حَدَّثَنِي جَعْفَرُ بْنُ رَبِيعَةَ نَحْوَهُ  


See similar narrations below:

Collected by Bukhārī, Muslim, Nasāʾī, Aḥmad, Nasāʾī's Kubrá
bukhari:390Yaḥyá b. Bukayr > Bakr b. Muḍar > Jaʿfar > Ibn Hurmuz > ʿAbdullāh b. Mālik Ibn Buḥaynah

Ibn Buhaina, "When the Prophet ﷺ prayed, he used to separate his arms from his body so widely that the whiteness of his armpits was visible."  

البخاري:٣٩٠أَخْبَرَنَا يَحْيَى بْنُ بُكَيْرٍ حَدَّثَنَا بَكْرُ بْنُ مُضَرَ عَنْ جَعْفَرٍ عَنِ ابْنِ هُرْمُزَ عَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ ابْنِ بُحَيْنَةَ

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا صَلَّى فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاضُ إِبْطَيْهِ وَقَالَ اللَّيْثُ حَدَّثَنِي جَعْفَرُ بْنُ رَبِيعَةَ نَحْوَهُ  

muslim:495aQutaybah b. Saʿīd > Bakr / Ibn Muḍar > Jaʿfar b. Rabīʿah > al-Aʿraj > ʿAbdullāh b. Mālik Ibn Buḥaynah

When the Prophet ﷺ prostrated, lie spread out his arms so that the whiteness of his armpits was visible.  

مسلم:٤٩٥aحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا بَكْرٌ وَهُوَ ابْنُ مُضَرَ عَنْ جَعْفَرِ بْنِ رَبِيعَةَ عَنِ الأَعْرَجِ عَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ ابْنِ بُحَيْنَةَ

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا صَلَّى فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاضُ إِبْطَيْهِ  

nasai:1106Qutaybah > Bakr > Jaʿfar b. Rabīʿah > al-Aʿraj > ʿAbdullāh b. Mālik Ibn Buḥaynah

When the Messenger of Allah ﷺ prayed he held his arms out so much that the whiteness of his armpits appeared.  

النسائي:١١٠٦أَخْبَرَنَا قُتَيْبَةُ قَالَ حَدَّثَنَا بَكْرٌ عَنْ جَعْفَرِ بْنِ رَبِيعَةَ عَنِ الأَعْرَجِ عَنْ عَبْدِ اللَّهِ بْنِ مَالِكِ ابْنِ بُحَيْنَةَ

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا صَلَّى فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاضُ إِبْطَيْهِ  

ahmad:22925Qutaybah b. Saʿīd > Bakr b. Muḍar > Jaʿfar b. Rabīʿah > al-Aʿraj > ʿAbdullāh b. Mālik Ibn Buḥaynah

When the Messenger of Allah ﷺ prayed he held his arms out so much that the whiteness of his armpits appeared. (Using translation from Nasāʾī 1106)  

أحمد:٢٢٩٢٥حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا بَكْرُ بْنُ مُضَرَ عَنْ جَعْفَرِ بْنِ رَبِيعَةَ عَنِ الْأَعْرَجِ عَنْ عَبْدِ اللهِ بْنِ مَالِكِ ابْنِ بُحَيْنَةَ

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا صَلَّى فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُوَ بَيَاضُ إِبْطَيْهِ  

nasai-kubra:697Qutaybah b. Saʿīd > Bakr > Jaʿfar b. Rabīʿah > al-Aʿraj > ʿAbdullāh b. Mālik b. Buḥaynah

When the Prophet ﷺ prostrated, lie spread out his arms so that the whiteness of his armpits was visible. (Using translation from Muslim 495a)  

الكبرى للنسائي:٦٩٧أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا بَكْرٌ عَنْ جَعْفَرِ بْنِ رَبِيعَةَ عَنِ الْأَعْرَجِ عَنْ عَبْدِ اللهِ بْنِ مَالِكِ بْنِ بُحَيْنَةَ

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا صَلَّى فَرَّجَ بَيْنَ يَدَيْهِ حَتَّى يَبْدُو بَيَاضَ إِبِطَيْهِ