Sahih Bukhari Volume 7, Book 62, Hadith Number 175.

Narrated By Abu Hazim : The people differed about the type of treatment which had been given to Allah’s Apostle on the day (of the battle) of Uhud. So they asked Sahl bin Sad As-Sa’id who was the only surviving Companion (of the Prophet) at Medina. He replied, “Nobody Is left at Medina who knows it better than I. Fatima was washing the blood off his face and ‘Ali was bringing water in his shield, and then a mat of date-palm leaves was burnt and (the ash) was inserted into the wound.”