In the meantime Bilal came and called him for prayer. He came out and passed by a person who had his fire-pan on the fire. The Messenger of Allah (ﷺ) said to him: Has the food in the fire-pan been cooked? He replied: Yes, my parents be sacrificed upon you. He then took a piece out of it and continued to chew it until he uttered the first takbir (AllahuAkbar) of the prayer. All this time I was looking at him.
In-book : Book 1, Hadith 193
English translation : Book 1, Hadith 193