Moses
Deuteronomy 32:17BSB·traditional attribution

They sacrificed to demons, not to God, to gods they had not known, to newly arrived gods, which your fathers did not fear.

Matthew Henry Presbyterian @wholebiblehenry

We have here a description of the apostasy of Israel from God, which would shortly come to pass, and to which already they had a disposition. One would have thought that a people under so many obligations to their God, in duty, gratitude, and interest, would never have turned from him; but, alas! they turned aside quickly.

Commenting on Deuteronomy 32:15-18

John Gill Reformed Baptist @doctorgill

Of the rock that begat thee thou art unmindful,.... The same with the rock of salvation, Deu 32:15; repeated and expressed in different words, that their wretched ingratitude might be taken notice of and observed: begetting is ascribed to this rock, as regeneration is to Christ, Jo1 2:29; and was true of some among the Jews: some choose to render the words, "the rock of...

Jamieson-Fausset-Brown Reformed @jfbcommentary

They sacrificed unto devils--(See on Lev 17:7).