Uncleanness is not a sin in and of itself. It’s a temporary state, not a permanent state. God shows here how to go from unclean to clean, not only of ourselves but of household items, clothing, etc. God is showing us how clean He is and how we are to become like him. This isn’t about “dos and don’ts” but because He wants us to be holy and to be His people.
One of the ways we can look at the mysterious apocalyptic phrase “abomination of desolation” is to see it as a “Tale of Three Cities” — Babylon, Tyre and Ninevah — and how all three cities are really symbolic of Yerushalayim (Jerusalem) herself. The carnage of the “abomination of desolation” will not come on Babylon, Tyre, Ninevah or any of our great cities of modern times like London, New York or Tokyo. From God’s prophets, we understand that it was and will be the people of Yerushalayim who will have a front row seat, and it will be for the same reasons for the previous desolations.
George Santayana said, “Those who cannot remember the past are condemned to repeat it.” We are blessed to read these repeated warning of the spiritual condition of people God calls before an “abomination of desolation” — and internalize the lessons.
Deuteronomy 17 covers the type of animals to be given for sacrifice, what to do with a person who is worshiping another god and when and how they will chose a king. Deuteronomy 18 explores Levites and their inheritance, a reminder to the children of Israel that they are not allowed to “learn to imitate the detestable things of those nations” and a foretelling of a Prophet will come who is even more powerful than Moses.