In Context

2 For the indignation of the LORD is on all nations, and his fury on all their armies: he has utterly destroyed them, he has delivered them to the slaughter.

3 Their slain also shall be cast out, and their stink shall come up out of their carcasses, and the mountains shall be melted with their blood.

4 And all the host of heaven shall be dissolved, and the heavens shall be rolled together as a scroll: and all their host shall fall down, as the leaf falls off from the vine, and as a falling fig from the fig tree.

5 For my sword shall be bathed in heaven: behold, it shall come down on Idumea, and on the people of my curse, to judgment.

6 The sword of the LORD is filled with blood, it is made fat with fatness, and with the blood of lambs and goats, with the fat of the kidneys of rams: for the LORD has a sacrifice in Bozrah, and a great slaughter in the land of Idumea.

7 And the unicorns shall come down with them, and the bullocks with the bulls; and their land shall be soaked with blood, and their dust made fat with fatness.

Isaiah 34:5 in Other Translations