Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
1783. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "None of you should point at his brother with a weapon. He does not know; perhaps Shaytan will make it slip from his hand thus making him fall into a pit of the Fire." [Agreed upon]
In one variant of Muslim he said that Abu'l-Qasim said, "If someone points with a piece of iron at his brother, the angels curse him until he puts it down, even if it is his full brother."