KJV: That he may establish thee to day for a people unto himself, and that he may be unto thee a God, as he hath said unto thee, and as he hath sworn unto thy fathers, to Abraham, to Isaac, and to Jacob.
NASB: in order that He may establish you today as His people and that He may be your God, just as He spoke to you and as He swore to your fathers, to Abraham, Isaac, and Jacob.
KJV: Lest there should be among you man, or woman, or family, or tribe, whose heart turneth away this day from the LORD our God, to go and serve the gods of these nations; lest there should be among you a root that beareth gall and wormwood;
NASB: so that there will not be among you a man or woman, or family or tribe, whose heart turns away today from the LORD our God, to go and serve the gods of those nations; that there will not be among you a root bearing poisonous fruit and wormwood.
KJV: Then men shall say, Because they have forsaken the covenant of the LORD God of their fathers, which he made with them when he brought them forth out of the land of Egypt:
NASB: "Then men will say, 'Because they forsook the covenant of the LORD, the God of their fathers, which He made with them when He brought them out of the land of Egypt.