I’m thinking it goes back to the garden. 14 And the LORD God said unto the serpent, Because thou hast done this, thou art cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life: 15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel. Genesis 3 KJV The serpent would naturally wish to keep tabs on the lineage of the women, perhaps to make sure that his false messiah doesn’t have the wrong genes?