What is the ruling on the Hajj of one who abandoned the stoning of the jamarat on the twelfth day, believing it to be the day of hastening, and departed without the farewell circumambulation?

His Hajj is valid, but he omitted three obligatory acts: spending the night in Mina on the twelfth night, stoning the Jamarat on the twelfth day, and the Farewell circumambulation (Tawaf al-Wada'). For each of these, he must offer a sacrifice (dam) to be slaughtered in Mecca and distributed among the poor.