Deuteronomy 24:9

Remember what the Lord, thy God, did unto Miriam by the way, after that ye were come forth out of Egypt. The point of the warning is that the children of Israel were carefully to guard against such sins as would bring the plague of leprosy upon them, for that this sickness was sometimes inflicted by the Lord as a direct punishment they had seen in the case of Miriam, Numbers 12:10. Deliberate disobedience of the Lord, also in disregarding the laws of sane living which nature teaches. may to this day result in bad diseases and bitter self-accusations.