SimchaMinute by Rabbi Avigdor Miller
"THEY ARE UNCLEAN, AND UNCLEAN THEY SHALL BE TO YOU" — Vayikra 11:35
The second part of this statement "and unclean they shall be to you" is a summons to Israel to recognize Hashem's exalted evaluation of His holy people.
This recognition requires the strictest adherence to these laws of purity and impurity... [and] also to utilize these laws and the incidents (when they need to be applied) as demonstrations of Hashem's very great regard for Israel His holy people, and as opportunities for Israel to appreciate their holy status. — Kingdom of Cohanim