'Altar to the Lord' in the Bible

And Noah built an altar to the Lord, and took of every [ceremonially] clean animal and of every clean bird and offered burnt offerings on the altar.

Then he moved on from there to the mountain on the east of Bethel, and pitched his tent, with Bethel on the west and Ai on the east; and there he built an altar to the Lord and called on the name of the Lord [in worship through prayer, praise, and thanksgiving].

Then Abram broke camp and moved his tent, and came and settled by the [grove of the great] terebinths (oak trees) of Mamre [the Amorite], which are in Hebron, and there he built an altar to [honor] the Lord.