Imam al-Shafi'i (may Allah have mercy on him) said: "The Messenger of Allah (peace and blessings be upon him) did not eat charity, (but) he (peace and blessings be upon him) ate from the charity that was given to Sayyidah Barirah (may Allah be pleased with her), and said: 'It is a gift for us and charity for her (Barirah).'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المكاتب / Q21665