Commentaries:
Jamieson, Fausset, and Brown
those which are not a people—that is, not favored with such great and peculiar privileges as the Israelites (or, rather poor, despised heathens). The language points to the future calling of the Gentiles.
Other Jamieson, Fausset, and Brown entries containing Deuteronomy 32:21:
Job 26:2-3
Psalms 31:5-6
Isaiah 10:15
Isaiah 65:3
Jeremiah 5:7
Jeremiah 7:19
Jeremiah 14:22
Jeremiah 25:7
Romans 10:19
Romans 11:11
1 Corinthians 10:22
Revelation 20:6
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