Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: The Prophet (peace and blessings be upon him) passed by the valley of al-Azraq and asked: "Which valley is this?" They said: The valley of al-Azraq. He (peace and blessings be upon him) said: "It is as if I am looking at Musa (peace be upon him) descending from the mountain pass, calling out loudly to Allah Almighty with the talbiyah." Then he reached a mountain pass named Harsha and asked: "Which mountain pass is this?" They said: Harsha. He (peace and blessings be upon him) said: "It is as if I am looking at Yunus bin Matta (peace be upon him) on a red she-camel, wearing a woollen cloak, the halter of his she-camel is of khulbah, and he is saying the talbiyah." Hushaym (may Allah have mercy on him) said: Khulbah means a rope of palm fibre.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9014