Leviticus 20:21-27

Let the Reader remark with me, in the perusal of these verses, the grounds on which the LORD enjoins sanctity of life and manners, and the very strong motives in which it is founded, namely, that the LORD is the GOD of his people in a covenant way, and that they are his people. So that being thus distinguished as the peculiar objects of his love, reason as well as revelation seems to demand that they should be the peculiar followers of his holy law. See what Moses elsewhere saith of this, Deuteronomy 33:29.