Genesis 24:3 records Abraham's instruction to marry within covenant kin — the principle Esau's Hittite marriages directly violate.

Genesis 27:46 reveals Rebekah's direct response to these marriages — she tells Isaac she's disgusted by Hittite women and uses this as pretext to send Jacob to Laban.

Genesis 28:1 is Isaac's direct consequence: because Esau married Hittites, Isaac commands Jacob to avoid Canaanite women and seek a wife from Laban's family.

Genesis 28:8 shows Esau's belated awareness that his parents disapproved — he tries to compensate by marrying Ishmael's daughter alongside his Hittite wives.

Genesis 36:2 gives the fuller genealogical list of Esau's wives, showing the same Hittite marriages expanded with additional names and lineage details.

Genesis 34:9 proposes intermarriage between Jacob's family and Shechem's people — the same pattern of foreign marriage alliances that caused grief with Esau.

Hebrews 12:16 explicitly identifies Esau as 'profane,' warning against his pattern of trading eternal inheritance for fleshly desires.

Malachi 2:15 warns against breaking faith by marrying foreign gods' daughters, seeking godly offspring — the theological principle behind why Esau's marriages grieved his parents.