Albert Barnes Commentary Ezekiel 21:4

"Seeing then that I will cut off from thee the righteous and the wicked, therefore shall my sword go forth out of its sheath against all flesh from the south to the north:" — Ezekiel 21:4 (ASV)

The righteous and the wicked – take the place of every green tree and every dry tree (Ezekiel 20:47); all faces takes the place of all flesh: to show the universality of the destructions. National judgment involves the innocent in the temporal ruin of the guilty. The equity of God is vindicated by the ruin being only temporal.

From the south to the north – From one end of the holy land to the other; the seer is in the north, and looks at once on the whole extent of the ruin.