Exodus Exodus 14:15-31
The crossing is creation re-enacted — the Spirit-wind over the waters, the sea split, the dry land appearing — and out of it comes the nation's first corporate faith: the people feared YHWH and believed, the only verse in the canon to join those two words.
Exodus Exodus 14:1-14
Trapped between the chariots and the sea, Israel is given four verbs — stand firm, see, be silent, and YHWH will fight — because salvation is God's work, seen and received, not achieved; the word Moses spoke at the shore carries inside it the name of the Savior.
Exodus Exodus 4:1-31
Moses fears the people will not believe him; the chapter ends with the words 'the people believed.' Between those poles God names Israel his firstborn son and arms the exodus with a threat that will fall on every Egyptian household.
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.