5, 6. (a) For what are the nations called to account by God? (b) How is it true that “the mountains must melt because of their blood”?

⁵ The prophecy now describes the dark outlook for ungodly nations​—a complete contrast to the bright hope of God’s people that is described later. (Isaiah 35:1-10) The prophet states: “Jehovah has indignation against all the nations, and rage against all their army. He must devote them to destruction; he must give them to the slaughter.

Isaiah 34:2,

⁶ Attention is drawn to the bloodguilt of the nations. Today the nations of Christendom have the most bloodguilt of all. In two world wars and in many smaller conflicts, they have soaked the earth with human blood. Who should rightly demand justice for all this bloodguilt? None other than the Creator, the great Life-Giver. (Psalm 36:9)

With the complete destruction of their military forces, the worldly nations will see the fall of their governments, which in Bible prophecy are sometimes pictured as mountains.​—Daniel 2:35, 44, 45; Revelation 17:9.