Musannaf Ibn Abi Shayba 35:171

Ibn ‘Uyaynah narrated to us, from Hajjaj bin Abi ‘Uthman, who said: Abu Raja’, the freed slave of Abu Qilabah, narrated to us, from Abu Qilabah, from Anas, that a group of eight men from ‘Ukl came to the Prophet, may Allah bless him and grant him peace, and pledged allegiance to him upon Islam. They found the land unhealthy and their bodies became ill, so they complained of that to the Prophet, may Allah bless him and grant him peace. He said, "Will you not go out with our shepherd among his camels, so that you may partake of their urine and their milk?" They said, "Yes." So they went out and drank from their urine and their milk. And it was mentioned that Abu Hanifah disliked the drinking of camel urine.