It is narrated from Sayyiduna Ali (may Allah be pleased with him), he says: When I narrate to you any hadith of the Messenger of Allah (peace and blessings be upon him), I would prefer to fall from the height of the sky rather than lie upon the Messenger of Allah (peace and blessings be upon him), but not lie. And when I narrate to you something from someone else, then remember that in those days I was in conflict with people, and conflict is called tricks and strategies. I heard the Messenger of Allah (peace and blessings be upon him) say: In the last era, some people will appear who will be young and of little understanding. They will narrate sayings of the Messenger of Allah (peace and blessings be upon him), but their faith will not go beyond their throats. Wherever you find these people, kill them, because their killers will receive the reward for this killing on the Day of Resurrection.