When a person has on the skin of his body a swelling or an eruption or a spot, and it turns into a leprous disease on the skin of his body, he shall be brought to Aaron the priest or to one of his sons the priests. 3 The priest shall examine the disease on the skin of his body, and if it is a leprous disease; after the priest has examined him he shall pronounce him ceremonially unclean. ... 17 the priest shall examine him, and if the disease has turned white, the priest shall pronounce the diseased person clean. He is clean.
Numbers 12:1-15 (Miriam's leprosy)
While they were at Hazeroth, Miriam and Aaron spoke against Moses because of the Cushite woman whom he had married (for he had indeed married a Cushite woman); and they said, "Has the LORD spoken only through Moses? Has he not spoken through us also?" And the LORD heard it. Now the man Moses was very humble, more so than anyone else on the face of the earth. Suddenly the LORD said to Moses, Aaron, and Miriam, "Come out, you three, to the tent of meeting." So the three of them came out. Then the LORD came down in a pillar of cloud, and stood at the entrance of the tent, and called Aaron and Miriam; and they both came forward. And he said, Hear my words:
When there are prophets among you,
I the LORD make myself known to them in visions;
I speak to them in dreams.
Not so with my servant Moses;
he is entrusted with all my house.
With him I speak face to face
clearly, not in riddles;
and he beholds the form of the LORD.
Why then were you not afraid to speak against my servant Moses? And the anger of the LORD was kindled against them, and he departed.
When the cloud went away from over the tent, Miriam had become leprous, as white as snow. And Aaron turned towards Miriam and saw that she was leprous. Then Aaron said to Moses, "Oh, my lord, do not punish us for a sin that we have so foolishly committed. Do not let her be like one stillborn, whose flesh is half consumed when it comes out of its mother's womb." And Moses cried to the LORD, "O God, please heal her." But the LORD said to Moses, "If her father had but spit in her face, would she not bear her shame for seven days? Let her be shut out of the camp for seven days, and after that she may be brought in again." So Miriam was shut out of the camp for seven days; and the people did not set out on the march until Miriam had been brought in again. (Num 12:1-15 NRSV)
Guard against an outbreak of a leprous skin disease by being very careful; you shall carefully observe whatever the levitical priests instruct you, just as I have commanded them. 9 Remember what the LORD your God did to Miriam on your journey out of Egypt.
According to Lachs [Rabbinic Commentary] (152), "the leper according to a rabbinic tradition, was considered as dead ... [B. Ned. 64b]"
Islamic traditions about Jesus
It is related that Jesus passed by a man who was blind, leprous, crippled, paralyzed on both sides of his body, and mutilated with lesions from leprosy. the man was saying, "Praise be to God, who healed me from what he has inflicted upon so many of his creatures." Jesus asked him, "You there what kind of affliction can I see that has not been visited upon you?" The man replied, "Spirit of God, I am better than him in whose heart God has not planted the share of His knowledge that He has planted in mine." "You have spoken truly," said Jesus, "Give me your hand." The man stretched forth his hand and behold, his face and form were transformed into the fairest and most comely, for God had cured him of his affliction. Thereafter, he accompanied Jesus and worshipped with him. [Muslim Jesus] (early 12C CE)