Where do we find the Immaculate Conception in Scripture?

For me, it is in this verse.  God said to the Serpent:

Genesis 3:15 (KJV)

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.

The Woman, Mary, is She who is in reference here. Because the Woman, Eve, has already cooperated with Satan. But the Woman, Mary, will never cooperate with Satan, will never feel the effects of sin, because she is conceived with a deep hatred of Satan (i.e. enmity) and a deeper love of God.