Maliks Muwatta Book 54, Hadith Number 19.
Section : Mice Falling into Clarified Butter, and giving Precedence to Food over the Prayer.
Malik related to me from Nafi that one time as Ibn Umar was served his evening meal, he heard the recitation of the Imam while he was in his house and he did not hurry from his food until he had finished what he needed.