"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)
«كَانَ النَّبِيُّ ﷺ إِذَا أَهَوَى إِلَى الْأَرْضِ سَاجِدًا جَافَى عَضُدَيْهِ عَنْ إِبِطَيْهِ وَفَتِخَ أَصَابِعَ رِجْلَيْهِ»
"When the Prophet ﷺ fell to the ground during prostration, he held his arms away from his sides and bent his toes."
كَانَ النَّبِيُّ ﷺ إِذَا أَهْوَى إِلَى الأَرْضِ سَاجِدًا جَافَى عَضُدَيْهِ عَنْ إِبْطَيْهِ وَفَتَخَ أَصَابِعَ رِجْلَيْهِ مُخْتَصَرٌ
[Machine] I heard Abu Humaid Al-Sa'id saying: "The Messenger of Allah ﷺ used to recite a supplication when he got up to perform prayer, then he would prostrate to the ground and place his arms on his sides, and spread his fingers and toes."
سَمِعْتُ أَبَا حُمَيْدٍ السَّاعِدِيَّ يَقُولُ كَانَ رَسُولُ اللهِ ﷺ إِذَا قَامَ إِلَى الصَّلَاةِ الْحَدِيثَ وَقَالَ فِيهِ ثُمَّ هَوَى إِلَى الْأَرْضِ سَاجِدًا ثُمَّ جَافَى عَضُدَيْهِ عَنْ إِبِطَيْهِ وَفَتَحَ أَصَابِعَ رِجْلَيْهِ