Musannaf Ibn Abi Shayba 36:260

Khalid ibn Makhlad narrated to us, he said: Malik ibn Anas narrated to us, from Abdullah ibn Abi Bakr, from a man who said: The helmet was smashed upon the head of the Messenger of Allah, may Allah bless him and grant him peace, on the day of Uhud. His incisor tooth was broken, and he was wounded in his face. He was treated with a burnt mat. Ali ibn Abi Talib used to carry water to him in his shield.