'Altar to the Lord' in the Bible

And Noah built an altar to the LORD, and took of every clean beast, and of every clean fowl, and offered burnt-offerings on the altar.

And the LORD appeared to Abram, and said, To thy seed will I give this land: and there he erected an altar to the LORD, who appeared to him.

And he removed from thence to a mountain on the east of Beth-el, and pitched his tent, having Beth-el on the west, and Hai on the east: and there he erected an altar to the LORD, and called upon the name of the LORD.

Then Abram removed his tent, and came and dwelt in the plain of Mamre, which is in Hebron, and built there an altar to the LORD.