Sayyiduna Ibn Umar (may Allah be pleased with them both) says: "The Messenger of Allah (peace and blessings be upon him) would spend the night at Dhu al-Hulayfah, then when he had prayed Fajr, he would sit on his mount and call out the Talbiyah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13298