Genesis Genesis 26:1-33
Genesis 26 is the only chapter in the Torah where Isaac is the active patriarch. The famine, the lie at Gerar, the hundredfold harvest, the four wells, the night theophany at Beersheba, and the treaty with Abimelech stage a deliberate replay of Abraham's life. But two verses make this chapter's contribution canonical: Genesis 26:5 (the fullest pre-Sinai cluster of Sinai-legal vocabulary in the canon — four legal nouns stacked together, citing the Akedah-oath) and Genesis 26:24 (the first installment of «I am the God of Abraham your father,» the formula Jesus deploys against the Sadducees and Stephen quotes at his death).
Genesis Genesis 21:1–34
Genesis 21 opens with the verb that will become the canon's word for divine intervention and closes with the divine epithet that will become the canon's word for God's eternity. Between them the narrator stages a birth, an expulsion, a wilderness rescue, a seven-fold oath, and a tamarisk planted at a well. Sarah speaks the Edenic expulsion-verb in the imperative; Yahweh ratifies her. God opens Hagar's eyes the way Eden's were opened, but to a well of water this time. The chapter is built as the Akedah's dress rehearsal, and two of its verses become the most exact verbatim citations of Genesis in the New Testament.
Genesis Genesis 20:1–18
Eighteen verses, two hundred eighty-two Hebrew words, and seven canonical first-mentions: prophet, dream, heal, fear-of-God, the verb to sin, integrity, innocence. The prophet enters Scripture as an intercessor for a Gentile king. The Gentile king speaks the integrity-of-heart formula David and Solomon will later inherit. The wombs of Gerar close so that the womb of Sarah can open. Genesis 20 is the canon's densest law-of-first-mention cluster outside Genesis 1–3, and the social location is the thing the chapter forces the reader to see.