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ibnmajah:1304[Chain 1] Hishām b. ʿAmmār > ʿĪsá b. Yūnus [Chain 2] ʿAbd al-Raḥman b. Ibrāhīm > al-Walīd b. Muslim > al-Awzāʿī > Nāfiʿ > Ibn ʿUmar

It was narrated from Ibn ‘Umar that the Messenger of Allah ﷺ used to set out for the praying place in the morning of the day of ‘Eid, and a small spear would be carried before him. When he reached the praying place, it would be set up in front of him, then he would pray facing it, and that was because the praying place was an open space in which there was nothing that could serve as a Sutrah*. *Sutrah (screen), meaning a barrier of some type.  

ابن ماجة:١٣٠٤حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ حَدَّثَنَا عِيسَى بْنُ يُونُسَ ح وَحَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ قَالاَ حَدَّثَنَا الأَوْزَاعِيُّ أَخْبَرَنِي نَافِعٌ عَنِ ابْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَغْدُو إِلَى الْمُصَلَّى فِي يَوْمِ الْعِيدِ وَالْعَنَزَةُ تُحْمَلُ بَيْنَ يَدَيْهِ فَإِذَا بَلَغَ الْمُصَلَّى نُصِبَتْ بَيْنَ يَدَيْهِ فَيُصَلِّي إِلَيْهَا وَذَلِكَ أَنَّ الْمُصَلَّى كَانَ فَضَاءً لَيْسَ فِيهِ شَىْءٌ يُسْتَتَرُ بِهِ  


See similar narrations below:

Collected by Bukhārī
bukhari:973Ibrāhīm b. al-Mundhir > al-Walīd > Abū ʿAmr > Nāfiʿ > Ibn ʿUmar

The Prophet ﷺ used to proceed to the Musalla and an 'Anaza used to be carried before him and planted in the Musalla in front of him and he would pray facing it (as a Sutra).  

البخاري:٩٧٣حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ قَالَ حَدَّثَنَا الْوَلِيدُ قَالَ حَدَّثَنَا أَبُو عَمْرٍو قَالَ أَخْبَرَنِي نَافِعٌ عَنِ ابْنِ عُمَرَ قَالَ

كَانَ النَّبِيُّ ﷺ يَغْدُو إِلَى الْمُصَلَّى وَالْعَنَزَةُ بَيْنَ يَدَيْهِ تُحْمَلُ وَتُنْصَبُ بِالْمُصَلَّى بَيْنَ يَدَيْهِ فَيُصَلِّي إِلَيْهَا