26 Afterward, his brother came out and his hand took of Esau’s heel, so his name was called Yahcob. Yitzshaq was sixty years old when she bore them. Genesis chapter 25.
Yah explained to Ezra in 2 Esdras 6:8-9 why Esau and Yahqob were born breech. Yah said Esau represents the end (foot) of one world and Yahqob represents the beginning (hand) of the next (world).