Genesis 15:1-21
Abram falls into a deep sleep while a smoking firepot and a flaming torch pass alone between the halved animals. The covenant is cut without his participation. One verse later, Yahweh reckons his faith as righteousness — a half-verse Paul will quote four times in Romans 4 alone. Gen 15 is the locus of the unilateral covenant, the chapter where God himself walks under the self-curse, and the OT verse from which the New Testament builds its entire grammar of grace.
Genesis 12:10-13:18
A heavy famine drives Abram down; a heavy wealth carries him back up. Between the two, Yahweh strikes Pharaoh with great plagues — the first plague-word in the canon. Then Lot lifts his eyes and chooses the plain that is about to burn, and Yahweh tells Abram to lift his eyes and see the land he will give to his seed forever. Gen 12:10–13:18 is the miniature Exodus that frames the covenant's first 'forever.'
Genesis 12:1-9
Two pericopes after Babel's tower falls, Yahweh speaks one man's name into a world that had just tried to name itself. The same noun (shem) recurs in deliberate inversion: humans cannot make a name for themselves, but Yahweh can give one. Gen 12:1–9 is the canonical answer to Babel, and the answer is one called man — walking, building altars, calling on Yahweh's name — whose seed will carry blessing back to all the clans of the ground.