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:1147ʿAbd al-Raḥman b. Ibrāhīm Duḥaym > Marwān b. Muʿāwiyah > ʿUbaydullāh b. ʿAbdullāh b. al-Aṣam > Yazīd b. al-Aṣam > Maymūnah

"When the Messenger of Allah ﷺ prostrated, he would hold his arms out to his sides, so that the whiteness of his armpits could be seen from behind. And when he sat he rested on his left thigh."  

النسائي:١١٤٧أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ دُحَيْمٌ قَالَ حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ الأَصَمِّ قَالَ حَدَّثَنِي يَزِيدُ بْنُ الأَصَمِّ عَنْ مَيْمُونَةَ قَالَتْ

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا سَجَدَ خَوَّى بِيَدَيْهِ حَتَّى يُرَى وَضَحُ إِبْطَيْهِ مِنْ وَرَائِهِ وَإِذَا قَعَدَ اطْمَأَنَّ عَلَى فَخِذِهِ الْيُسْرَى  


See similar narrations below:

Collected by Muslim, Dārimī, Ṭabarānī, Nasāʾī's Kubrá
muslim:497aIsḥāq b. Ibrāhīm al-Ḥanẓalī > Marwān b. Muʿāwiyah al-Fazārī > ʿUbaydullāh b. ʿAbdullāh b. al-Aṣam > Yazīd b. al-Aṣam

When the Messenger of Allah ﷺ prostrated himself, he spread his arms, i. e. he separated them so much that the whiteness of his armpits became visible from behind and when he sat (for Jalsa) he rested on his left thigh.  

مسلم:٤٩٧aحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ أَخْبَرَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ الْفَزَارِيُّ قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ الأَصَمِّ عَنْ يَزِيدَ بْنِ الأَصَمِّ

أَنَّهُ أَخْبَرَهُ عَنْ مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ قَالَتْ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا سَجَدَ خَوَّى بِيَدَيْهِ يَعْنِي جَنَّحَ حَتَّى يُرَى وَضَحُ إِبْطَيْهِ مِنْ وَرَائِهِ وَإِذَا قَعَدَ اطْمَأَنَّ عَلَى فَخِذِهِ الْيُسْرَى  

darimi:1371Isḥāq b. Ibrāhīm > Marwān > ʿUbaydullāh b. ʿAbdullāh b. al-Aṣam > Yazīd b. al-Aṣam

When the Messenger of Allah ﷺ prostrated himself, he spread his arms, i. e. he separated them so much that the whiteness of his armpits became visible from behind and when he sat (for Jalsa) he rested on his left thigh. (Using translation from Muslim 497a)  

الدارمي:١٣٧١حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ حَدَّثَنَا مَرْوَانُ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ الْأَصَمِّ عَنْ يَزِيدَ بْنِ الْأَصَمِّ

عَنْ مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ قَالَتْ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا سَجَدَ خَوَّى بِيَدَيْهِ يَعْنِي جَنَّحَ حَتَّى يُرَى وَضَحُ إِبْطَيْهِ مِنْ وَرَائِهِ وَإِذَا قَعَدَ اطْمَأَنَّ عَلَى فَخِذِهِ الْيُسْرَى  

tabarani:20513Isḥāq b. Dāwud al-Ṣawwāf > Muḥammad b. Sinān al-Qazzāz > Isḥāq b. Idrīs > Marwān b. Muʿāwiyah > ʿUbaydullāh b. ʿAbdullāh b. al-Aṣam > Yazīd b. al-Aṣam > Maymūnah

[Machine] The Prophet ﷺ used to lean on his left thigh when he sat down.  

الطبراني:٢٠٥١٣حَدَّثَنَا إِسْحَاقُ بْنُ دَاوُدَ الصَّوَّافُ ثنا مُحَمَّدُ بْنُ سِنَانٍ الْقَزَّازِ ثنا إِسْحَاقُ بْنُ إِدْرِيسَ ثنا مَرْوَانُ بْنُ مُعَاوِيَةَ عَنْ عُبَيْدِ اللهِ بْنِ عَبْدِ اللهِ بْنِ الْأَصَمِّ عَنْ يَزِيدَ بْنِ الْأَصَمِّ عَنْ مَيْمُونَةَ قَالَتْ

«كَانَ النَّبِيُّ ﷺ كَانَ إِذَا قَعَدَ اطْمَأَنَّ عَلَى فَخِذِهِ الْيُسْرَى»  

nasai-kubra:737ʿAbd al-Raḥman b. Ibrāhīm Duḥaym al-Dimashqī > Marwān > ʿUbaydullāh b. ʿAbdullāh b. al-Aṣam > Yazīd b. al-Aṣam > Maymūnah

"When the Messenger of Allah ﷺ prostrated, he would hold his arms out to his sides, so that the whiteness of his armpits could be seen from behind. And when he sat he rested on his left thigh." (Using translation from Nasāʾī 1147)  

الكبرى للنسائي:٧٣٧أَخْبَرَنِي عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ دُحَيْمٌ الدِّمَشْقِيُّ قَالَ حَدَّثَنَا مَرْوَانُ قَالَ حَدَّثَنَا عُبَيْدُ اللهِ بْنُ عَبْدِ اللهِ بْنِ الْأَصَمِّ قَالَ حَدَّثَنِي يَزِيدُ بْنُ الْأَصَمِّ عَنْ مَيْمُونَةَ قَالَتْ

«كَانَ رَسُولُ اللهِ ﷺ إِذَا سَجَدَ خَوَّى بِيَدَيْهِ حَتَّى يُرَى وَضَحُ إِبِطَيْهِ مِنْ وَرَائِهِ وَإِذَا قَعَدَ اطْمَأَنَّ عَلَى فَخِذِهِ الْيُسْرَى»