Deuteronomy 32:17

Unto devils — Unto idols, which the devils brought into the world in opposition to God, in and by which the devils often manifested themselves to men, and gave them answers, and received their worship. The Gentiles pretended to worship God in those idols, and the devils which inspired them, deluded the nations with pretences that they were a sort of lower gods. Moses takes off this mark, and shews the Israelites that these pretended gods were really devils, and therefore that it was the height of madness to honour or worship them. Not to God — For God utterly rejected those sacrifices which they offered to him together with idols. They knew not — Or, who never knew them, that is, never shewed any kindness to them, or did them any good: New gods — Not simply or absolutely, for some of these had been worshipped for many generations, but comparatively to the true God, who is the ancient of days, Deuteronomy 7:9, and who was worshipped from the beginning of the world. Feared not — Served not, worshipped not.