I will put enmity between you and the woman in between your offspring and her offspring. This is taken from Genesis 3:15.
How intense would this enmity be? “He [the offspring of the woman] will crush your [Satan’s] head, and you will strike him in the heel,” said Jehovah. The enmity between the serpent and the woman would be so fierce that Satan would spare no effort to obliterate her offspring.It is no wonder that the psalmist cried out in prayer to God about His chosen people: “Look! your enemies are in an uproar; those who hate you act arrogantly. With cunning they secretly plot against your people; they conspire against your treasured ones. They say: ‘Come, let us annihilate them as a nation.'” Psalms 83:2-4 tells us: “For look! your enemies are in an uproar; Those who hate you act arrogantly. With cunning they secretly plot against your people; They conspire against your treasured ones. They say: “Come, let us annihilate them as a nation, So that the name of Israel may be remembered no more.” The line of descent of the offspring of the woman had to be protected from extermination and contamination. To accomplish this, Jehovah made binding legal arrangements that would protect the fulfillment of his purpose.