Deuteronomy 24:8 in the World English Bible
Be careful in the plague of leprosy, that you observe diligently and do according to all that the Levitical priests teach you. As I commanded them, so you shall observe to do.
Context
7 If a man be found stealing any of his brethren of the children of Israel, and maketh merchandise of him, or selleth him; then that thief shall die; and thou shalt put evil away from among you.
8 Take heed in the plague of leprosy, that thou observe diligently, and do according to all that the priests the Levites shall teach you: as I commanded them, so ye shall observe to do.
9 Remember what the LORD thy God did unto Miriam by the way, after that ye were come forth out of Egypt.