Genesis 25:33
"And Jacob said, Swear to me this day; and he sware unto him: and he sold his birthright unto Jacob."
Cross References (ranked by relevance)
Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright.
And he said, Is not he rightly named Jacob? for he hath supplanted me these two times: he took away my birthright; and, behold, now he hath taken away my blessing. And he said, Hast thou not reserved a blessing for me?
For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
And I will make thee swear by the LORD, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell:
And he sware unto her, Whatsoever thou shalt ask of me, I will give it thee, unto the half of my kingdom.
And Abram said to the king of Sodom, I have lift up mine hand unto the LORD, the most high God, the possessor of heaven and earth,