Thematic Bible: Jacob obtains his brother's birthright by an unjust advantage

Jacob was boiling pottage (lentil stew) one day, when Esau came from the field and was faint [with hunger]. And Esau said to Jacob, I beg of you, let me have some of that red lentil stew to eat, for I am faint and famished! That is why his name was called Edom [red]. Jacob answered, Then sell me today your birthright (the rights of a firstborn). read more.
Esau said, See here, I am at the point of death; what good can this birthright do me? Jacob said, Swear to me today [that you are selling it to me]; and he swore to [Jacob] and sold him his birthright.