Mukhtasar Muslim (Abridged) 170 — A person without ablution may eat

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) came out of the toilet and food was brought. People reminded him about ablution, so he (peace and blessings be upon him) said: "Am I about to pray that I should perform ablution?"