The next few chapters recycle rules from Leviticus, but they are a little bit more urgent and practical, because occupation of the promised land is so imminent. And there is a bit more explanation of what they mean about God.
He are the rules about kosher food, and beyond being described as clean or unclean, the reason is described as being “because you are God’s treasured possession”
It’s clear there is not always anything inherently wrong with unclean food. For example, animals that are already dead are unclean, everything must be ritually slaughtered for purpose. But they can be cooked or sold for foreigners. It’s just about remembering how much God loves his people.
This chapter also covers tithes. They are a social welfare system, they end up supporting the priests and also widows, fatherless, and foreigners. There is a practical edge to it too, how to cope if they live too far from the temple.
It’s setting up a generous society of high prosperity and low inequality. The society of people who are treasured by God. That is my society.