43 Ye shall not make yourselves abominable with any creeping thing that creepeth, neither shall ye make yourselves unclean with them, that ye should be defiled thereby.
44 For I am the Lord your God; ye shall therefore sanctify yourselves, and ye shall be holy; for I am holy; neither shall ye defile yourselves with any manner of creeping thing that creepeth upon the earth.
45 For I am the Lord that bringeth you up out of the land of Egypt, to be your God; ye shall therefore be holy, for I am holy.
46 This is the law of the beasts, and of the fowl, and of every living creature that moveth in the waters, and of every creature that creepeth upon the earth;
47 To make a difference between the unclean and the clean, and between the beast that may be eaten and the beast that may not be eaten.
Leviticus 12 Intro: The laws of purification.
1 And the Lord spake unto Moses, saying,
2 Speak unto the children of Israel, saying, If a woman have conceived seed, and borne a man child, then she shall be unclean seven days; according to the days of the separation for her infirmity shall she be unclean.
3 And in the eighth day, the man child shall be circumcised.
4 And she shall then continue in the time of her purifying which shall be three and thirty days; she shall touch no hallowed thing, nor come into the sanctuary, until the days of her purifying be fulfilled.
5 But if she bear a maid child, she shall be unclean two weeks, as in her separation; and she shall continue in the time of her purifying threescore and six days.