Deuteronomy 26:18

26:18 and Yahweh has declared you this day to be a people for his own possession, as he has promised you, and that you should keep all his commandments;
-World English Bible

Other Translation

26:18 And the LORD hath avouched thee this day to be his peculiar people, as he hath promised thee, and that [thou] shouldest keep all his commandments;
-King James Version