He saw the Prophet ﷺ eat a piece of meat at the prayer ground and then pray without performing ablution.
حدثنا أبو عامر حدثنا فليح عن الزهري حدثني
أنه رأى النبي ﷺ أكل عضوا في المصلى ولم يتوضأ
Its isnad is sahih. Jafar bin Amr bin Umaya is reliable, and his hadith is found in the Sahihayn. The hadith was mentioned earlier at 17045.