# must be cut off from

"that person may no longer live among his people" or "you must separate that person from his people" 

# menstrual period

the time every month when a woman bleeds from her womb

# he has uncovered her flow, the fountain of her blood

"he has done a shameful thing by uncovering the flow of her blood" 

# a man lies with a woman

"a man has sexual relations with a woman"

# Both the man and woman must be cut off

"Because they have done this shameful thing, both the man and woman must be cut off"