سنن النسائي

It was narrated that Anas bin Malik said: "Some Bedouin from 'Uraynah came to the Prophet (ﷺ) of Allah [SAW] and accepted Islam, but the climate of Al-Madinah did not suit them; their skin turned yellow and their bellies became swollen. The Prophet (ﷺ) of Allah sent them to some milk camels of his and told them to drink their milk and urine until they recovered. Then they killed their herdsmen and drove off the camels. The Prophet (ﷺ) of Allah sent (men) after them and they were brought back, then he had their hands and feet cut off, and their eyes were branded." The Commander of the Believers, 'Abdul-Malik, said to Anas, when he was narrating this Hadith: "Was that (punishment) for Kufr or for sin?" He said: "For Kufr."