It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both), he says: We were with the Noble Prophet (peace and blessings be upon him), he went to the place of relieving himself and after relieving himself, he came out. Food was brought for him. Someone said: O Messenger of Allah! Will you not perform ablution? The Prophet (peace and blessings be upon him) said: I do not have to pray now that I should perform ablution. I have only been commanded to perform ablution when I have to pray.