God told Moses to speak to the people: they were not to copy the practices of Egypt, where they had lived, or Canaan, where they were going. They were to follow God’s rules and laws.
Then came strict boundaries for family life. The Israelites were warned not to treat close relatives in forbidden ways, such as a parent, stepparent, sibling, grandchild, aunt, uncle’s wife, daughter-in-law, or a brother’s wife. They were also told not to take a woman and her daughter, or her granddaughter, and not to take a wife as a rival to her sister during the sister’s lifetime. They were warned not to approach a woman during her menstrual period, and not to have relations with a neighbor’s wife.
God also forbade offering children to Molech and commanded the people not to profane God’s name. Other forbidden acts were named as well. God said the land had been defiled by such practices before, and warned Israel not to do the same, whether citizen or stranger, so the land would not “spew out” its inhabitants.