What does Genesis 27:13 mean?

Jacob has raised a very real concern with his mother, about her scheme to trick Isaac into giving Jacob the blessing instead of Esau (Genesis 27:6–10). What if Isaac catches him in the act? Won't it be worse than if he did nothing at all? Won't he end up being cursed instead of blessed? This moment does not reflect well on Jacob; he's entirely on board with the idea of using deception (Genesis 25:29–34), and is only really concerned about being caught.

Rebekah doesn't have time for Jacob's objections, however. If the plan is going to work, she has to get started on the meal right away. She insists that she will take any curse Isaac might give instead to Jacob. Then she commands her son to obey his mother.

On one hand, Rebekah is fighting for the son she loves, though in practice she practices blatant favoritism (Genesis 25:28). She also probably sees her actions as working toward the fulfillment of the prophecy given to her by the Lord when she was pregnant with the boys. At that time, God said the older one would serve the younger (Genesis 25:23). She may have told herself she was scheming for the will of the Lord: "helping" God obtain His will.

On the other hand, she is pushing her son to deceive and dishonor his father. Rebekah is encouraging her son to lie, and to betray his brother. And she is using her parental authority to manipulate him to do so. Nobody in this story is fully innocent. Rebekah will pay a steep price for her sin, as it turns out. When the dust settles, her son Jacob will have fled, returning only after her death (Genesis 27:43–44).