The third law revealed on this day was the command that the children of Israel put out of the camp every leper and every unclean person. When Israel moved out of Egypt, the majority of the people were afflicted with physical defects and diseases, contracted during their work on the structures they had been compelled to erect in Egypt. One had his hand crushed by a falling stone, another's eye blinded by splashing of loam.
It was a battered and crippled host that reached Sinai, eager to receive the Torah, but God said: "Does it become the glory of the Torah that I should bestow it on a race of cripples? Nor do I want to await the coming of another, sound generation, for I desire no further delay of the revelation of the Torah." Hereupon God sent angels to heal all among Israel that were diseased or afflicted with defects, so that all the children of Israel were sound and whole when they received the Torah.
They remained in this condition until they worshipped the Golden Calf, when all their diseases returned as a punishment for their defection from God. Only the women, during their stay in the desert, were exempt from the customary ailments to which women are subject, as a reward for being the first who declared themselves ready to accept the Torah. When the Tabernacle had been consecrated, God now said to Moses: "So long as you had not yet erected the Tabernacle, I did not object to having the unclean and the lepers mingle with the rest of the people, but now that the sanctuary is erected, and that My Shekinah dwells among you, I insist upon your separating all these from among you, that they may not defile the camp in the midst of which I dwell."