That he saw Messenger of Allah ﷺ cutting a piece of mutton from its shoulder part he was carrying in his hand. When he was called for prayer, he put it down and the knife with which he was cutting it. Then he stood up and offered the prayer without performing new ablution. (Using translation from Bukhārī 5462)  

أَخْبَرَهُ أَنَّهُ رَأَى رَسُولَ اللَّهِ ﷺ «يَحْتَزُّ مِنْ كَتِفِ شَاةٍ فِي يَدِهِ ثُمَّ دُعِيَ إِلَى الصَّلَاةِ فَأَلْقَى السِّكِّينَ الَّتِي كَانَ يَحْتَزُّ بِهَا ثُمَّ قَامَ فَصَلَّى وَلَمْ يَتَوَضَّأْ»