Musnad Ahmad 32:993

Isma'il narrated to us, Hajjaj bin Abi 'Uthman narrated to us, Abu Raja', the freed slave of Abu Qilabah, narrated to me, from Abu Qilabah, who said: "I shall narrate to you the hadith of Anas bin Malik as he narrated it to me." Anas bin Malik narrated to me that a group of eight men from 'Ukl came to the Messenger of Allah (ﷺ) and pledged allegiance to him upon Islam. The land did not agree with them, so their bodies became ill. They complained of that to the Messenger of Allah (ﷺ), and he said: "Will you not go out with our shepherd with his camels, so you may partake of their urine and their milk?" They went out and drank from their urine and their milk, and they became healthy. Then they killed the shepherd and drove away the livestock. That reached the Messenger of Allah (ﷺ), so he sent [men] in their tracks. They were overtaken and brought back. He ordered that their hands and feet be cut off, and their eyes be branded with hot irons, then they were cast into the sun until they died.