'It is I' in the Bible

When a man has a rising in the skin of his flesh, or a scab or bright spot, and it is in the skin of his flesh like the plague of leprosy, then he shall be brought to Aaron the priest, or to one of his sons the priests.

and if the priest sees it, and behold, it is in sight lower than the skin, and the hair of it has turned white, the priest shall pronounce him unclean. It is a plague of leprosy broken out in a boil.

then the priest shall look on it. And behold, the hair in the bright spot has turned white, and it is in sight deeper than the skin, it is leprosy broken out of the burning. Therefore the priest shall pronounce him unclean. It is the plague of leprosy.

then the priest shall see the plague. And behold, if it is in sight deeper than the skin, and a yellow thin hair is in it, then the priest shall pronounce him unclean. It is a dry scab, a leprosy on the head or beard.