The Prophet (ﷺ) used his right hand for getting water for ablution and taking food, and his left hand for his evacuation and for anything repugnant.
Sunan Abi Dawud Book 1, Hadith 33
← Previous Hadith The Prophet (ﷺ) used his right hand for taking his food and drink and used his left hand for other purposes.

Sunan Abi Dawud Book 1, Hadith 32 Next Hadith → Aishah, also reported a tradition bearing similar meaning through another chain of transmitters.

Sunan Abi Dawud Book 1, Hadith 34