'Altar of the Lord' in the Bible

Then Solomon stood before the altar of the Lord in the presence of all the assembly of Israel and spread out his hands toward heaven.

When Solomon had finished praying this entire prayer and supplication to the Lord, he arose from before the altar of the Lord, from kneeling on his knees with his hands spread toward heaven.

Then Elijah said to all the people, “Come near to me.” So all the people came near to him. And he repaired the altar of the Lord which had been torn down.