In Isaiah 25 and 26 God has accomplished the restoration of Israel and Judah. God has punished the nations that would harm them. They sing out praises to God for His justice and righteousness. Isaiah tells the people that this time of oppression will pass and God will establish His reign on earth.
Psalm 104 is a song of praise to the greatness of God. God is sovereign over all the earth. He is in charge of everything. He provides His creature’s needs and keeps all things in order. The Lord deserves our praise.