Sahih Bukhari
Medicine
Volume: 007 / Book Number: 071 / Hadith Number: 623
Narrated Anas bin Malik:
Some people from the tribes of 'Ukl and 'Uraina came to Allah's Apostle and embraced Islam and said, "O Allah's Apostle! We are owners of livestock and have never been farmers," and they found the climate of Medina unsuitable for them. So Allah's Apostle ordered that they be given some camels and a shepherd, and ordered them to go out with those camels and drink their milk and urine. So they set out, but when they reached a place called Al-Harra, they reverted to disbelief after their conversion to Islam, killed the shepherd and drove away the camels. When this news reached the Prophet he sent in their pursuit (and they were caught and brought). The Prophet ordered that their eyes be branded with heated iron bars and their hands be cut off, and they were left at Al-Harra till they died in that state.