سنن أبي داود

‘Ubaidah (al-salman) said : ‘Ali mentioned about the people of al Nahrawan, saying: Among them there will be a man with a defective hand or with a small hand. if you were not to overjoy. I would inform you of what Allah has promised (the reward for) those who will kill them at the tongue of Muhammad (May peace be upon him). I asked : Have you heard this from him? He replied : Yes, by the lord of the Ka’bah.