Sayyidah Umm al-Husayn (may Allah be pleased with her) said: I performed the Farewell Hajj with the Prophet (peace and blessings be upon him). I saw that when he (peace and blessings be upon him) had stoned the Jamrah and returned, he (peace and blessings be upon him) was on his mount, and with him (peace and blessings be upon him) were Sayyiduna Bilal and Sayyiduna Usamah (may Allah be pleased with them both). One of them was leading his (peace and blessings be upon him) mount, while the other was shading the head of the Messenger of Allah (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9553