Musnad Ahmad 626:92

Abu al-Mughirah narrated to us, Ma'an ibn Rifa'ah narrated to us, 'Ali ibn Yazid narrated to me, from al-Qasim Abu 'Abd al-Rahman, from Abu Umamah al-Bahili, from al-Mughirah ibn Shu'bah, who said: The Messenger of Allah (ﷺ) called me for water, so I went to a tent, and behold, there was a Bedouin woman in it. I said: "This is the Messenger of Allah (ﷺ), and he wants water to perform ablution, do you have any water?" She said: "May my father and mother be sacrificed for the Messenger of Allah (ﷺ). By Allah, there is no soul under the sky or upon the earth more beloved to me than his soul, nor more dear. However, this water skin is the hide of a dead animal, and I do not like to defile the Messenger of Allah (ﷺ) with it." I returned to the Messenger of Allah (ﷺ) and informed him. He said: "Go back to her, for if she has tanned it, then its tanning is its purification." He said: I returned to her and mentioned that to her. She said: "Yes, by Allah, I have tanned it." So I brought him water from it. He was wearing a Syrian cloak on that day, and he had on two leather socks and a head covering (khimar). He said: He inserted his hands from beneath the cloak, due to the narrowness of its sleeves. He then performed ablution and wiped over the head covering and the two leather socks.