Yahya related to me from Malik from Yahya ibn Said from Yaqub ibnKhalid al-Makhzumi that Abu Asma, the mawla of Abdullah ibn Jafar,told him that he was with Abdullah ibn Jafar when they set out oncefrom Madina. At as-Suqya they passed by Husayn ibn Ali, who was ill atthe time. Abdullah ibn Jafar stayed with him and then, when he fearedthat he was late (for the hajj) he left, and sent for Ali ibn AbiTalib and Asma bint Umays in Madina, and they came to Husayn. ThenHusayn pointed to his head, and AIi told someone to shave his head.Then he sacrificed an animal for him at as-Suqya, killing a camel forhim.Yahya ibn Said added, "Husayn had set out with Uthmanibn Affan on that particular journey to Makka. "
USC-MSA web (English) reference: Book 20, Hadith 174
Arabic reference: Book 20, Hadith 875