Genesis 26:34

and I will make you swear by Yahweh, the God of heaven and the God of earth, that you shall not take a wife for my son from the daughters of the Canaanites, among whom I live,

Then Rebekah said to Isaac, “I am tired of living because of the daughters of Heth; if Jacob takes a wife from the daughters of Heth, like these, from the daughters of the land, what good will my life be to me?”

So Esau saw that the daughters of Canaan were displeasing in the sight of his father Isaac;

and Esau went to Ishmael and took Mahalath, the daughter of Ishmael, Abraham’s son, the sister of Nebaioth, to be his wife, besides the wives that he had.

Then David answered and said to Ahimelech the Hittite and to Abishai the son of Zeruiah, Joab’s brother, saying, “Who will go down with me to Saul in the camp?” And Abishai said, “I will go down with you.”

that also there be no sexually immoral or godless person like Esau, who sold his own birthright for a single meal.