I saw the Messenger of Allah (ﷺ) throwing pebbles on the day of sacrifice while on his riding beast and saying: Learn your rites, for I do not know whether I am likely to perform Hajj after this occasion.
Sunan Abi Dawud Book 11, Hadith 250
← Previous Hadith Nafi' reported on the authority of Ibn Umar. He (ibn Umar) used to come (to Mina) and threw pebbles three days after the day of sacrifice walking when arriving and returning (both ways). He reported that the Prophet (ﷺ) used to do so.

Sunan Abi Dawud Book 11, Hadith 249 Next Hadith → I saw the Messenger of Allah (ﷺ) throwing pebbles on the day of sacrifice while on his riding beast in the forenoon, and next when the sun had passed the meridian.

Sunan Abi Dawud Book 11, Hadith 251