Musnad Ahmad 1243:1

Muhammad ibn Salamah narrated to us, from Abu Abd al-Rahim, from Zayd ibn Abi Unaysah, from Yahya ibn al-Husayn, from Umm al-Husayn, his grandmother, who said: "I performed Hajj with the Prophet, peace and blessings of Allah be upon him, during the Farewell Pilgrimage. I saw Usamah ibn Zayd and Bilal, and one of them was holding the noseband of the Prophet’s she-camel, while the other was raising his garment to shade him from the heat, until he threw the pebbles at Jamrat al-Aqabah."