Musnad Ahmad 1378

It was narrated from "Asim bin Kulaib, that his father said: I was sitting with ‘Ali (رضي الله عنه) and he said: I entered upon the Messenger of Allah (ﷺ) and there was no one with him except "A"ishah (رضي الله عنها), and he said: “O son of Abu Talib, how would you be with people of such and such a type?” I said: Allah and his Messenger know best. He said: "Some people will emerge from the East who recite the Qur"an but it will go no further than their collarbones. They will pass out of the faith as the arrow passes out of the prey. Among them will be a man with a deformed arm, as if his arm is the breast of an Abyssinian woman.”