Charles Ellicott Commentary Leviticus 19:1

"And Jehovah spake unto Moses, saying," — Leviticus 19:1 (ASV)

And the Lord spoke to Moses. —The prohibitions in the preceding chapter, designed to regulate moral conduct between relatives and close associates in their family circles, are now followed by precepts affecting every aspect of an Israelite’s life, both towards God and man.

Therefore, the authorities during the Second Temple period regarded it as “embodying the Decalogue”; for this reason, and also because it “contains the sum and substance of the precepts of the Law,” it was read in public. The precepts in this chapter are divided into sixteen groups, eight of which end with the emphatic reiteration, I am the Lord your God (Leviticus 19:2–4; Leviticus 19:10; Leviticus 19:25; Leviticus 19:31; Leviticus 19:34; Leviticus 19:36), and eight with the shorter formula, I am the Lord (Leviticus 19:12; Leviticus 19:14; Leviticus 19:16; Leviticus 19:18; Leviticus 19:28; Leviticus 19:30; Leviticus 19:32; Leviticus 19:37).