Musnad Abu Ya'la al-Mawsili 147:42

Mujahid ibn Musa narrated to us, Marwan al-Fazari narrated to us, Hilal Abu Mu'alla ibn Hilal narrated to us, he said: I heard Anas ibn Malik saying: Three birds were gifted to the Prophet, may Allah bless him and grant him peace, so he fed his servant one bird. When the next day came, she brought it to him. The Messenger of Allah, may Allah bless him and grant him peace, said to her: "Did I not forbid you from keeping anything for tomorrow? For Allah brings the provision of every tomorrow."