Musannaf Ibn Abi Shaybah

Hazrat Ibn Jurayj says that I asked Hazrat Ata, "Do you leave Arafat before the Imam (departs)?" He replied, "No."

Hazrat Ibn Umar (may Allah be pleased with both of them) used to leave Arafat before the Imam.

Hazrat Ibrahim bin Abdul A'la says that one of our companions left Arafat before the Imam. I asked Hazrat Mujahid about this matter. He said that he should offer a sacrifice, (sacrifice is obligatory upon him).

Hasan says that if someone leaves Arafat before the Imam, then sacrifice becomes obligatory.