Jamieson, Fausset and Brown on Zechariah 7:14

14. whirlwind--of wrath (Na 1:3).

nations whom they knew not--foreign and barbarous.

desolate after them--after their expulsion and exile. It was ordered remarkably by God's providence, that no occupants took possession of it, but that during the Jews' absence it was reserved for them against their return after seventy years.

they laid ... desolate--The Jews did so by their sins. The blame of their destruction lay with themselves, rather than with the Babylonians (2Ch 36:21).

pleasant land--Canaan. Literally, "the land of desire" (Jr 3:19).