In transgressing his covenant That is, in idolatry, as it is explained Deuteronomy 17:3, which is called a transgression of God's covenant made with Israel, both because it was a breach of their faith given to God, and of that law which they covenanted to keep; and because it was a dissolution of that matrimonial covenant with God, a renouncing of God and his worship, and a choosing other gods.
Related Commentaries of Deuteronomy 17:2
Deuteronomy 17:2
2 If there be found among you, within any of thy gates which the LORD thy God giveth thee, man or woman, that hath wrought wickedness in the sight of the LORD thy God, in transgressing his covenant,