Abu Dawud Book 1, Hadith Number 195.

Chapter : Strictness in performing ablution after eating anything cooked with help of fire.

Narated By Umm Habibah : Abu Sufyan ibn Sa’id ibn al-Mughirah reported that he entered upon Umm Habibah who presented him a glass of sawiq (a drink prepared with flour and water) to drink. He called for water and rinsed his mouth. She said: O my cousin, don’t you perform ablution? The Prophet (PBUH) said: Perform ablution after eating anything cooked with fire, or he said: anything touched by fire.

Abu Dawud said: The version of al-Zuhri has: O my paternal cousin.