Whom God had not given to them — For their worship, but hath divided them unto all nations, for their use and service. So he speaks here of the sun and moon and stars, which were the principal gods worshipped by the neighbouring nations.
Related Commentaries of Deuteronomy 29:26
Deuteronomy 29:26
26 For they went and served other gods, and worshipped them, gods whom they knew not, and whom he had not given unto them: