Leprosy was a dreaded skin disease suffered by many. The Lord spoke to Moses and Aaron and gave them instructions for identifying and managing active and inactive cases of the disease. Other conditions such as rot, fungus and mildew may have also been referred to as leprosy. Clothing and houses could be infected. Persons or objects with active cases of leprosy were deemed to be unclean.
An unclean person was to be isolated from others to prevent the spread of the disease. Laws were also presented that dealt with the cleansing of individuals whose cases of leprosy had become inactive.