Albert Barnes Commentary Isaiah 34:2

"For Jehovah hath indignation against all the nations, and wrath against all their host: he hath utterly destroyed them, he hath delivered them to the slaughter." — Isaiah 34:2 (ASV)

For the indignation of the Lord - Yahweh is about to express his wrath against all the nations which are opposed to his people.

He hath utterly destroyed them - In his purpose, or intention. The prophet represents this as so certain that it may be exhibited as already done.