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
nasai:1101 – Muḥammad b. Bashhār > Yaḥyá b. Saʿīd > ʿAbd al-Ḥamīd b. Jaʿfar > Muḥammad b. ʿAṭāʾ > Abū Ḥumayd al-Sāʿidī

"When the Prophet ﷺ fell to the ground during prostration, he held his arms away from his sides and bent his toes."  

النسائي:١١٠١ – أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ قَالَ حَدَّثَنَا عَبْدُ الْحَمِيدِ بْنُ جَعْفَرٍ قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ عَطَاءٍ عَنْ أَبِي حُمَيْدٍ السَّاعِدِيِّ قَالَ

كَانَ النَّبِيُّ ﷺ إِذَا أَهْوَى إِلَى الأَرْضِ سَاجِدًا جَافَى عَضُدَيْهِ عَنْ إِبْطَيْهِ وَفَتَخَ أَصَابِعَ رِجْلَيْهِ مُخْتَصَرٌ  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:692 – Muḥammad b. Bashhār > Yaḥyá b. Saʿīd > ʿAbd al-Ḥamīd b. Jaʿfar > Muḥammad b. ʿAṭāʾ > Abū Ḥumayd al-Sāʿidī

"When the Prophet ﷺ fell to the ground during prostration, he held his arms away from his sides and bent his toes." (Using translation from Nasāʾī 1101)  

الكبرى للنسائي:٦٩٢ – أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ قَالَ حَدَّثَنَا عَبْدُ الْحَمِيدِ بْنُ جَعْفَرٍ قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ عَطَاءٍ عَنْ أَبِي حُمَيْدٍ السَّاعِدِيِّ قَالَ

«كَانَ النَّبِيُّ ﷺ إِذَا أَهَوَى إِلَى الْأَرْضِ سَاجِدًا جَافَى عَضُدَيْهِ عَنْ إِبِطَيْهِ وَفَتِخَ أَصَابِعَ رِجْلَيْهِ»