Now the glory of the God of Israel had gone up from the cherub, where it had been, to the threshold of the temple. And He called to the man clothed with linen, who had the writer’s inkhorn at his side; and the LORD said to him, “Go through the midst of the city, through the midst of Jerusalem, and put a mark on the foreheads of the men who sigh and cry over all the abominations that are done within it.” To the others He said in my hearing, “Go after him through the city and kill; do not let your eye spare, nor have any pity. Utterly slay old and young men, maidens and little children and women; but do not come near anyone on whom is the mark; and begin at My sanctuary.” So they began with the elders who were before the temple. [Ezekiel 9:3-6]
The LORD sent angels to destroy Jerusalem. Among them was one clothed in linen, and had an inkhorn. His task was to mark out those people who were not involved with acts of abominations, so that those people would not be killed. The commentaries have differing views regarding the identity of this angel. Some believe this was the pre-incarnated Christ, while some disagree. I believe it is safe to say he represented Christ because those with his mark were not killed, and they were protected from God’s judgment. Followers of Christ are covered with His blood, and thus protected from the wrath in the last days.