Ezekiel 9:5-6

Then I heard God say to the other men, “I want you to follow the first man. You must kill all those who do not have the mark on their foreheads. It doesn’t matter if they are elders, young men or young women, children or mothers—you must use your weapon and kill everyone who does not have the mark on their forehead. Don’t show any mercy. Don’t feel sorry for anyone. Start here at my Temple.” So they started with the elders in front of the Temple.