And Nadab and Abihu ... offered strange fire before the LORD, which he commanded them not. And there went out fire from the LORD, and devoured them, and they died before the LORD. 10:1
God killed Aaron's sons by burning them to death and then told Aaron not to mourn them. This was used in a Watchtower video as an example for parents to shun their disfellowshipped children. (The video has since been deleted at JW.org do to a lawsuit in Norway addressing the shunning of disfellowshipped children by their parents.)
10:6