Hadith 2816
Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "When going to Arafat, go beyond the valley of ‘Urnah, and (when coming to Muzdalifah) hasten past the valley of Muhassir."
Hadith 2817
Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that it used to be said: "Go beyond the Valley of Muhassir and the Valley of 'Aranah." The meaning of 'Aranah is that you should not stay in the Valley of 'Arafah, and the prohibition regarding the Valley of Muhassir means that when staying in Muzdalifah, do not stop in the Valley of Muhassir; rather, leave it and stay ahead.