Narrated Abd Allaah bin Muhammad: We were in the company of Aishah. When her food was brought in, al-Qasim stood up to say his prayer. Thereupon, Aishah said: I heard the Messenger of Allaah صلی اللہ علیہ وسلم say: Prayer should not be offered in presence of meals, nor at the moment when one is struggling with two evils (e. g. when one is feeling the call of nature. )