Musnad Abu Ya'la al-Mawsili 117:37

Ibrahim ibn al-Hajjaj al-Sami narrated to us, Hammad narrated to us, from Thabit, Qatadah, and Humayd, from Anas: That people from 'Uraynah came to the Prophet, may Allah bless him and grant him peace, and they found the climate of Medina unsuitable (fajtawuha). So the Prophet, may Allah bless him and grant him peace, sent them to the camels of the Sadaqah, and he ordered them to drink from their urine and their milk.