This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

Elon the Hittite.

Genesis 26:34 View context

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:

Ishmael.

Genesis 36:2-3 View context

Esau took his wives of the daughters of Canaan; Adah the daughter of Elon the Hittite, and Aholibamah the daughter of Anah the daughter of Zibeon the Hivite;

And Bashemath Ishmael's daughter, sister of Nebajoth.