In (Genesis 12:7) the covenant becomes architectural. The Lord appears to Abram, says To thy sons will I give this land, and Abram answers with stones. He builds an altar.
Targum Pseudo-Jonathan phrases the exchange with quiet precision: the Lord was revealed unto Abram, and Abram built an altar before the Lord, who was revealed to him. Notice the doubling. The revelation is mentioned twice. The altar is not built to reach up toward a hidden God; it is built in the exact place where the hiddenness broke.
This is the Targum's theology of sacred space in miniature. A place becomes holy not because a person decides it is, but because the Holy One has already made Himself visible there. The altar is not an invitation. It is a marker of a visit. Abram is building a monument to the fact that he was seen — and saw.
There is a pattern starting here that will run through the whole Hebrew Bible. Revelation, then altar. Jacob will do it at Bethel (Genesis 28:18). Moses will do it at Sinai (Exodus 24:4). The motion is always the same. God shows up. The human builds something that says, Here. It happened here.
The Targumist's small addition — who was revealed to him — insists that the altar means nothing apart from the encounter that preceded it. Stones without revelation are just stones. Stones stacked where the Holy One was seen become the first architecture of the covenant. The tradition begins with a man who refuses to walk away from a place of meeting without marking it.