John Gills Exposition of the Bible Commentary - Psalms 68:32
Sing unto God, ye kingdoms of the earth ,.... Not only the Egyptian and Ethiopian kingdoms, but all the kingdoms of the world; which will now be converted to Christ, and become his, even all the Papal, Pagan, and Mahometan kingdoms; see Revelation 11:15 . These are called upon to sing songs and hymns of praise to Christ, who is God, for redemption by him, and salvation in him; and for their deliverance from all the darkness and delusions under which they formerly were; O sing praises... read more
Matthew Henry's Complete Commentary - Psalms 68:32-35
The psalmist, having prayed for and prophesied of the conversion of the Gentiles, here invites them to come in and join with the devout Israelites in praising God, intimating that their accession to the church would be the matter of their joy and praise (Ps. 68:32): Let the kingdoms of the earth sing praises to the Lord; they all ought to do it, and, when they become the kingdoms of the Lord and of his Christ, they will do it. God is here proposed to them as the proper object of praise upon... read more