There are different punishments mentioned in this chapter: death, “cutting off from the people” or childlessness. God is simply warning the Israelites that He will not tolerate these types of sins that are commonly committed in Canaan. He is throwing the Canaanites out because of these kinds of transgressions. He is educating the Israelites and doesn’t want them to commit the same sins that got the Canaanites kicked out of the land. God is telling them what is holy and what is unholy.
There’s a common theme occurring throughout the Hebrew Roots/Messianic community recently — separation and regrouping. We also see in Scripture the recurring symbol of “cutting off” in an agricultural sense to talk about God’s action in improving the health of the “vine” of Israel. It’s OK when God cuts off parts of the vine to promote growth. It’s OK if there is a time of not producing fruit.
This passage has three seemingly distinct teachings — parable of the shrewd manager, whether the Law and Prophets stopped with Yokhanan the Baptizer and a “one-liner” on divorce — but all of them as well as the parable that follows of the rich man and Lazar deal with one topic: God as Master or wealth as Master.