Ezekiel 9:4-6
4
Yahweh said to him, Go through the midst of the city, through the midst of Jerusalem, and set a mark on the foreheads of the men that sigh and that cry over all the abominations that are done in its midst.
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To the others he said in my hearing, Go through the city after him, and strike: don't let your eye spare, neither have pity;
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kill utterly the old man, the young man and the virgin, and little children and women; but don't come near any man on whom is the mark: and begin at my sanctuary. Then they began at the old men that were before the house.