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bukhari:972Muḥammad b. Bashhār > ʿAbd al-Wahhāb > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

On the day of ʿId-ul-Fitr and ʿId-ul-Adha a spear used to be planted in front of the Prophet (as a Sutra for the prayer) and then he would pray.  

البخاري:٩٧٢حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ قَالَ حَدَّثَنَا عَبْدُ الْوَهَّابِ قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ النَّبِيَّ ﷺ كَانَ تُرْكَزُ الْحَرْبَةُ قُدَّامَهُ يَوْمَ الْفِطْرِ وَالنَّحْرِ ثُمَّ يُصَلِّي