Isaac is getting old and is now blind anddying. He calls for Esau, his firstborn son, and asks him to go and catch some wild game and cook him a meal. Isaac's wife, Rebecca, overheard this and immediately goes to work to make sure that Jacob gets the blessing. Jacob protests since he is a smooth-skinned man unlike his hairy brother, but Rebecca knows has a plan. They go and kill two young kid goats and cook them as a meal for Isaac, and Jacob wears the goat skins on his arms so that Isaac will feel the fur. Jacob also wears Esau's musky hunting clothes. When he serves him the meal and wine, Isaac is very satisfied but is confused— he's pretty sure it's actually Jacob rather than Esau because of his voice. There's a moment where he feels his furry arms and smells the scent of Esau's clothes. Maybe it was a combination of the convincing disguise and wine or uncertainty in his own mental faculties from failing health, but he gives Jacob the blessing originally intended for his firstborn. Esau comes back and is fuming mad and wants to kill his brother. Isaac gives him a lesser blessing saying that he'll live by the sword and he blessed by the fatness of the earth and will eventually brake the yoke his brother puts upon him. Rebekah sends Jacob away because she doesn't want him philandering with Canaanites like Esau, nor does she want Esau to murder him.
When I first read this chapter, I remember thinking that Jacob acted like kind of a dick. I was more mad at Rebekah for coordinating everything. Rereading it now, I think it was obviously the right choice. Esau didn't care about the commandments of his father and mother nor God. They were specifically not supposed to marry and have kids with Canaanite women, yet here he was. He cared so little for the blessing of his father that he was willing to trade it for beans (red lentil stew). Think about that. This dude grows up in what is basically a super rich household with tons of servants and likely thousands of head of cattle, and he's like "yeah I'm just gonna go screw around innawoods and get some 3️⃣ Canaanite women 3️⃣ ". Not good! He would have defiled the blessing had he received it, and God had already declared to Rebekah what was to happen with the older serving the younger.
RT: https://poa.st/objects/9880ff24-e655-4f6f-9f29-906a30d93d2c