Genesis 12
7 Ref And the Lord came to Abram, and said, I will give all this land to your seed; then Abram made an altar there to the Lord who had let himself be seen by him.
8 Ref And moving on from there to the mountain on the east of Beth-el, he put up his tent, having Beth-el on the west and Ai on the east: and there he made an altar and gave worship to the name of the Lord.