Sunan Abi Dawud
Hadith #378
Ali b. Abi Talib reported the Prophet (ﷺ) as saying:He narrated the tradition to the same effect, but he did not mention the words ""until the age of eating"". This version adds: Qatadah said: This is valid until the time they do not eat food; when they begin to eat, their urine should be washed