Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.042A.

Section : Before eating food touched by fire.

Said Ibrahim ibn ‘Abdullah ibn Qarizh, “I passed by Abu Hurairah while he was performing ablution and he said, ‘Do you know why I am making ablution? It is because I ate some yoghurt dried over a fire, for I heard the Messenger of Allah say, ‘Perform ablution before eating food touched by fire.” (Related by Ahmad, Muslim and “the four.”)

‘Aishah related that the Prophet, upon whom be peace, said, “Perform ablution from whatever touches fire.” (Related by Ahmad, Muslim, an-Nasa’i and Ibn Majah.) This order is one of preference as the following hadith makes clear: ‘Amr ibn Umayyah azhZhamari said, “I saw the Messenger of Allah, upon whom be peace, cutting a piece of a sheep’s shoulder and eating it. He was then called to prayer. He put the knife down, prayed, and did not perform another ablution.” (Related by al-Bukhari and Muslim.)