We learn of the many kinds of impurity that descended with the serpent and how some of them clung to the female; when she is defiled harsh judgments circulate in the world. When the woman wants to be purified she must cut her hair and her nails.
402. We have learned that 125 kinds of impurity descended to earth joined AND HELD BY the side of the mighty serpent, and the greater 27 of them hold to the female to join with her. Woe to anyone approaching her at this time, for one who does approach her points to a defect above. With this sin, the mighty serpent above is awakened to spew poison in places where he should not, and he joins the female. The hairs of the male grow and the female is defiled. Her hair grows and her nails grow. Then harsh Judgments begin circulating in the world and everything becomes defiled. This is the essence of the verse, "Because he has defiled the sanctuary of Hashem" (Bemidbar 19:20). The sanctuary of Hashem was defiled due to sins of mankind.
403. We have learned that which is written, "And I will put enmity (Heb. ve'eivah) between you and the woman" (Beresheet 3:15). The serpent placed 24 types of defilement in the female when he joined with her, according to the numerical value of "ve'eivah," 24 types stir above and 24 below. The hairs grow and nails grow, then Judgments are awakened in the world. We have learned that when a woman wishes to purify, she needs to cut THE AMOUNT OF hair that grew from the time she became unclean and needs to cut her nails and all the filth within them.