Ezekiel 9:4-6

The LORD said to him, “Go through the midst of the city, throughout all of Jerusalem, and put a mark on the foreheads of the men who sigh [in distress] and grieve over all the repulsive acts which are being committed in it.” But to the others I heard Him say, “Follow him [the man with the scribe’s writing case] throughout the city and strike; do not let your eyes have pity and do not spare [anyone]. Utterly slay old men, young men, maidens, little children, and women; but do not touch or go near anyone on whom is the mark. Begin at My sanctuary.” So they began with the old men who were in front of the temple [who did not have the LORD’S mark on their foreheads]. [1 Pet 4:17]