Lev 18:1-4
By the words, “I am Jehovah your God,” which are placed at the head and repeated at the close (Lev 18:30), the observance of the command is enforced upon the people as a covenant obligation, and urged upon them most strongly by the promise, that through the observance of the ordinances and judgments of Jehovah they should live (Lev 18:5).