If I cause noisome beasts to pass through the land, and they spoil it, so that it be desolate, that no man may pass through because of the beasts:
The argument is cumulative. He first puts the case of the land sinning, so as to fall under the judgment of a "famine" (Ezekiel 14:13); then (Ezekiel 14:15) "noisome beasts" (Leviticus 26:22); then "the sword" (Ezekiel 14:17); then, worst of all, "pestilence" (Ezekiel 14:19): the three most righteous of men should deliver only themselves in these several four cases. In Ezekiel 14:21 he concentrates the whole in one mass of condemnation. If Noah, Daniel, Job could not deliver the land, when deserving only one judgment, "how much more," when all four judgments combined are justly to visit the land for sin, shall these three righteous men not deliver it!
Verse 19. If I send a pestilence ... and pour out my fury upon it in blood - not literally. In the Hebrew "blood" expresses every premature kind of death.
Verse 21. How much more - literally, 'Surely shall it be so now, when I send,' etc. If none could avert the one only judgment incurred, surely now, when all four are incurred by sin, much more impossible it will be to deliver the land.