Joshua 23:16

When ye have transgressed the covenant of the Lord your God,
which he commanded you
The law, so called, and the several precepts of it, particularly those which relate to the faith and worship of the one only true God; see ( Exodus 24:7 Exodus 24:8 ) ;

and have gone and served other gods, and have bowed down yourselves
unto them;
been guilty of idolatry, of having and worshipping other gods, which are no gods, with or besides the God of Israel, see ( Joshua 23:7 ) ;

then shall the anger of the Lord be kindled against you;
nothing being more provoking to him than idolatry, he being a jealous God of his honour and worship:

and ye shall perish quickly from off the good land which he hath given
unto you;
as they did at the time of the Babylonish captivity, and at the last destruction of Jerusalem by the Romans.