Which thou hast commanded by thy servants the prophets
 Moses, and Joshua, and others, see ( Deuteronomy 7:3 ) ( Joshua 23:12 ) ( Judges 2:2 ) 
 saying, the land, unto which ye go to possess it;
 meaning the land of Canaan: 
 is an unclean land with the filthiness of the people of the lands,
 with their abominations, which have filled it from one end to another
 with their uncleanness;
 which is to be understood not of their idolatries only, but of their incestuous marriages, and impure copulations, on which account the Lord spewed out the old inhabitants of it; for which reason the Jews ought to have been careful not to have defiled it again by similar practices; see (  Leviticus 18:1-30 ) .