Sayyiduna Usamah bin Zayd (may Allah be pleased with him) said: I rode behind the Messenger of Allah (peace and blessings be upon him) from Arafat. When the Messenger of Allah (peace and blessings be upon him) reached the mountain pass before Muzdalifah, he made his mount kneel and urinated. Then he (peace and blessings be upon him) came, and I poured the water of ablution for him (peace and blessings be upon him), and he (peace and blessings be upon him) performed a light ablution. I said: "O Messenger of Allah (peace and blessings be upon him)! The prayer." He (peace and blessings be upon him) said: "The prayer is ahead of you." He (peace and blessings be upon him) mounted until he came to Muzdalifah and prayed. Then on the morning of Jam', Sayyiduna al-Fadl (may Allah be pleased with him) rode behind him (peace and blessings be upon him). Kurayb (may Allah have mercy on him) said: Sayyiduna Ibn Abbas (may Allah be pleased with them both) told me, narrating from Sayyiduna al-Fadl (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) kept saying the talbiyah until he stoned Jamrat al-Aqabah.
The shi'b (mountain pass) is the place which the rulers enter.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9487