'Altar of the Lord' in the Bible

And Solomon stood before the altar of the LORD in the presence of all the congregation of Israel, and spread forth his hands toward heaven:

And it was so, that when Solomon had made an end of praying all this prayer and supplication unto the LORD, he arose from before the altar of the LORD, from kneeling on his knees with his hands spread up to heaven.

And Elijah said unto all the people, Come near unto me. And all the people came near unto him. And he repaired the altar of the LORD that was broken down.