Arabic (Original)
أَخْبَرَنَا أَبُو عَلِيٍّ الرُّوذْبَارِيُّ أنبأ مُحَمَّدُ بْنُ بَكْرٍ ثنا أَبُو دَاوُدَ ثنا الْحَسَنُ بْنُ عَلِيٍّ ثنا ابْنُ نُمَيْرٍ عَنْ عُبَيْدِ اللهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ ؓ أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا خَرَجَ يَوْمَ الْعِيدِ أَمَرَ بِالْحَرْبَةِ فَتُوضَعُ بَيْنَ يَدَيْهِ فَيُصَلِّي إِلَيْهَا وَالنَّاسُ وَرَاءَهُ وَكَانَ يَفْعَلُ ذَلِكَ فِي السَّفَرِ فَمِنْ ثَمَّ اتَّخَذَهَا الْأُمَرَاءُ
English Translation
Abu Ali al-Rudhbari informed us, Muhammad ibn Bakr informed us, Abu Dawud narrated to us, al-Hasan ibn Ali narrated to us, Ibn Numayr narrated to us from Ubaydullah from Nafi' from Ibn Umar (may Allah be pleased with him) that the Messenger of Allah (peace be upon him) used to, when he went out on the day of Eid, order a spear to be placed in front of him and he would pray facing it while the people were behind him. He also used to do this while traveling. From this practice, the rulers adopted it.