Genesis 28:9
"Then went Esau unto Ishmael, and took unto the wives which he had Mahalath the daughter of Ishmael Abraham’s son, the sister of Nebajoth, to be his wife."
Cross References (ranked by relevance)
Genesis 36:3
And Bashemath Ishmael’s daughter, sister of Nebajoth.
Genesis 26:34
And Esau was forty years old when he took to wife Judith the daughter of Beeri the Hittite, and Bashemath the daughter of Elon the Hittite:
Genesis 36:18
And these are the sons of Aholibamah Esau’s wife; duke Jeush, duke Jaalam, duke Korah: these were the dukes that came of Aholibamah the daughter of Anah, Esau’s wife.
Genesis 36:13
And these are the sons of Reuel; Nahath, and Zerah, Shammah, and Mizzah: these were the sons of Bashemath Esau’s wife.