The Prophet ﷺ used to slaughter his sacrificial animal at the place of prayer. Ibn 'Umar used to do so.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَذْبَحُ أُضْحِيَتَهُ بِالْمُصَلَّى وَكَانَ ابْنُ عُمَرَ يَفْعَلُهُ