1 He cried also in Mine ears with a loud voice, saying, "Cause them that have charge over the city to draw near, even every man with his destroying weapon in his hand."
God is upset enough He is yelling at Ezekiel.
(Remember, this is all a vision Ezekiel is having while sitting in his house in Babylon).
2 And, behold, six men came from the way of the higher gate, which lies toward the north, and every man a slaughter weapon in his hand; and one man among them was clothed with linen, with a writer’s inkhorn by his side: and they went in, and stood beside the brazen altar.
3 And the glory of the God of Israel was gone up from the cherub, whereupon He was, to the threshold of the house. And He called to the man clothed with linen, which had the writer’s inkhorn by his side;
The Lord had instructed Moses to build the Ark of the Covenant with two, six foot cherubs surrounding the Mercy seat. He also had them make a brass altar for sacrifices. Both these pieces of furniture were located in the Temple at Jerusalem.
Since Ezekiel is introduced to the Glory of God in his first vision, he recognizes it here again. He sees this Glory rise from off the Mercy Seat on the altar at Jerusalem, sitting on the Cherubs, and begin to give instruction to the man with the inkhorn.
4 And the Lord said unto him, "Go through the midst of the city, through the midst of Jerusalem, and set a mark upon the foreheads of the men that sigh and that cry for all the abominations that be done in the midst thereof."
God tells the man/angel with the inkhorn to put a mark on everyone who is distressed because of the sins of Israel, those who are truly seeking God’s face and righteousness.
5 And to the others He said in mine hearing, "Go ye after him through the city, and smite: let not your eye spare, neither have ye pity:
6 "Slay utterly old and young, both maids, and little children, and women: but come not near any man upon whom is the mark; and begin at My sanctuary." Then they began at the ancient men which were before the house.
The men/angels were instructed to totally destroy everyone in the city without mercy, beginning at the elders and rulers sitting at the gate to the Temple. They were commanded, however, not to touch those with the Mark of God on them. God protected those who truly loved Him. They would suffer in the conquest with lack of food and the trauma of seeing their friends, family and neighbors destroyed, but God would preserve them, personally.
7 And He said unto them, "Defile the house, and fill the courts with the slain: go ye forth." And they went forth, and slew in the city.
Humans are unclean, so dead people in the Temple would spiritually defile it. God commands this defilement and the Babylonians killed many people in the Temple itself.
8 And it came to pass, while they were slaying them, and I was left, that I fell upon my face, and cried, and said, "Ah Lord God! Will Thou destroy all the residue of Israel in Thy pouring out of Thy fury upon Jerusalem?"
Ezekiel knows there won’t be very many with God’s Mark on them. The vast majority of the city will be destroyed.
9 Then said He unto me, "The iniquity of the house of Israel and Judah is exceeding great, and the land is full of blood, and the city full of perverseness: for they say, 'The Lord has forsaken the earth, and the Lord sees not.'"
God tells Ezekiel that the city is already defiled with blood because of the sins of the people. The overall attitude of Israel is “God is dead” or “There is no God.” They believed they could make their own rules, set their own standards for morality.
10 "And as for Me also, Mine eye shall not spare, neither will I have pity, but I will recompense their way upon their head."
God is simply fed up. He’s had enough!
11 And, behold, the man clothed with linen, which had the inkhorn by his side, reported the matter, saying, "I have done as thou have commanded me."