v1-4: The glory of the Lord remained, as judgment is prepared. Following the exposure of the idolatry, the Lord is not impotent, and judgment necessarily follows.
But first, those who do not deserve judgment are identified, those who grieve and lament over the state of affairs. This is the faithful remnant, a small number remaining true to God. The godly weep over sins, but also share concern for God's glory. The faithful are marked on the forehead, Rev 7.3; 9.4, and thus protected from judgment.
v5: No pity or compassion; once the faithful are marked, the rest are to be put to death.
v6-7: "Begin at my sanctuary," see Amos 7.8; 1 Pet 4.17; the greater responsibility for leaders.
v8: Ezekiel's prayer; surely God would not destroy His people totally! His forehead may be flint (3.9), but his heart remained soft. The prophet cannot remain unmoved by the condition of the people.
v9-11: The Lord's answer, referring to the sin of Israel and Judah as "exceedingly great." They deserved judgment, not only for the seriousness of their sins, but for the persistence in them, and their repeated refusals to repent.