Ezekiel 9:1-4

1 Then he cried in my ears with a loud voice, saying, Cause you them that have charge over the city to draw near, every man with his destroying weapon in his hand.  2 Behold, six men came from the way of the upper gate, which lies toward the north, every man with his slaughter weapon in his hand; and one man in the midst of them clothed in linen, with a writer's inkhorn by his side. They went in, and stood beside the brazen altar.  3 The glory of the God of Israel was gone up from the cherub, whereupon it was, to the threshold of the house: and he called to the man clothed in linen, who had the writer's inkhorn by his side.  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 the midst of it.