Altar: Built by Abraham
Source: Nav
Genesis 12:7, 8
Then the LORD appeared to Abram and said, “I will give this land to your offspring.” So Abram built an altar there to the LORD, who had appeared to him. / From there Abram moved on to the hill country east of Bethel and pitched his tent, with Bethel to the west and Ai to the east. There he built an altar to the LORD, and he called on the name of the LORD.
Genesis 13:18
So Abram moved his tent and went to live near the Oaks of Mamre at Hebron, where he built an altar to the LORD.
Genesis 22:9
When they arrived at the place God had designated, Abraham built the altar there and arranged the wood. He bound his son Isaac and placed him on the altar, atop the wood.