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 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.