'Heel' in the Bible

And I will put enmity between thee and the woman, and between thy seed and her seed; he shall crush thy head, and thou shalt crush his heel.

And after that came his brother out; and his hand took hold of Esau's heel; and his name was called Jacob. And Isaac was sixty years old when they were born.

Gad troops will rush upon him; But he will rush upon the heel.