[Machine] The Messenger of Allah ﷺ attended the year of the conquest and prayed the dawn prayer. Then he took off his sandals and placed them on his left side.  

حَضَرَتُ رَسُولَ اللهِ ﷺ عَامَ الْفَتْحِ فَصَلَّى الصُّبْحَ فَخَلَعَ نَعْلَيْهِ فَوَضَعَهُمَا عَنْ يَسَارِهِ  

The Prophet ﷺ said: When any of you prays, he should not place his sandals on his right side or on his left so as to be on the right side of someone else, unless no one is at his left, but should place them between his feet. (Using translation from Abū Dāʾūd 654)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ إِذَا صَلَّى أَحَدُكُمْ فَلَا يَضَعْ نَعْلَيْهِ عَنْ يَمِينِهِ وَلَا عَنْ يَسَارِهِ فَيَكُونَ عَنْ يَمِينِ غَيْرِهِ إِلَّا أَنْ لَا يَكُونَ عَنْ يَسَارِهِ أَحَدٌ وَلْيَضَعْهُمَا بَيْنَ رِجْلَيْهِ لَفْظُ حَدِيثِ أَبِي دَاوُدَ فِي الْإِسْنَادِ وَالْمَتْنِ  

when any of you prays and takes off his sandals, he should not harm anyone by them. He should place them between his feet or pray with them on (Using translation from Abū Dāʾūd 655)   

عَنْ رَسُولِ اللهِ ﷺ قَالَ إِذَا صَلَّى أَحَدُكُمْ فَخَلَعَ نَعْلَيْهِ فَلَا يُؤْذِ بِهِمَا أَحَدًا وَيَجْعَلْهُمَا مَا بَيْنَ رِجْلَيْهِ أَوْ لِيُصَلِّ فِيهِمَا