Abdullah (bin Umar) told him that the Messenger of Allah ﷺ used to offer sacrifice in the prayer place. (Using translation from Nasāʾī 1589)  

أَخْبَرَهُ أَنَّ رَسُولَ اللهِ ﷺ كَانَ «يَذْبَحُ أَوْ يَنْحَرُ بِالْمُصَلَّى»  

the Messenger of Allah offered the sacrifice obn the Day of Sacrifice in Al-Madinah. He said: "if he did not offer the Nahr (sacrifice a camel) he would have offered Dhabihah (Sacrificed a sheep) at the prayer place." (Using translation from Nasāʾī 4367)  

أَنَّ رَسُولَ اللهِ ﷺ نَحَرَ يَوْمَ الْأَضْحَى بِالْمَدِينَةِ قَالَ «وَقَدْ كَانَ إِذَا لَمْ يَنْحَرْ ذَبَحَ بِالْمُصَلَّى»