Ezekiel 9:1-2

Then [in my vision] I heard Him cry out with a thunderous voice, saying, “Approach now, executioners of the city, each with his weapon of destruction in his hand.” Behold, six men [angelic beings] came from the direction of the Upper Gate, which faces north, each with his battle-axe in his hand; and among them was a certain man clothed in linen, with a scribe’s writing case at his side. They entered and stood beside the bronze altar.