مسند أحمد

Abu Katheer, the freed slave of the Ansar, narrated: I was with my master `Ali bin Abi Talib (رضي الله عنه) when the people of an-Nahrawan were killed, and it was as if the people were upset about their being killed. `Ali (رضي الله عنه) said: O people, the Messenger of Allah (ﷺ) told us about people who would pass out of the faith like the arrow passes through the prey, then they will never come back to it until the arrow comes back to the string of the bow. And the sign of that is that there would be a black man among them who had a deformed arm: one of his arms would be like the breast of a woman, with a nipple like the nipple on a woman`s breast, around which are seven coarse hairs. Look for him, for I think he must be among them. So they looked for him and they found him on the bank of the river, lying beneath the slain. They brought him out and ’Ali (رضي الله عنه) said: Allahu Akbar! Allah and His Messenger spoke the truth. He was holding an Arabian bow of his; he took it in his hand and started poking the man`s deformity with it and said: Allah and His Messenger spoke the truth. The people said Allahu Akbar when they saw that and they rejoiced and no longer felt upset.