Midrash

The Midrash says: And I will remember my covenant with Jacob. This is what the Psalmist is referring to when he said: “You took the vine from Egypt, etc.”( Psalms 80:9) Just like the vine is supported by dry trees and is still moist, so too, the people of Israel rely on their Forefathers merit’ -even though the forefathers are asleep.( Vayikrah Rabba 36)
                                                              (Gen. 23:6).

Rabbi Huna said: ”Prior to Abraham, there were many who wanted to be buried there but could not enter the place because of a fire emanating from it. The fire was put there by the ministering angels who were guarding the place. When Abraham came, he entered and bought the place.

                                   (Pirkei DeRabbi Elazar Chap. 36)

The purchase of the Cave of the Machpelah by Jacob is brought by our sages as a central motivating feature of redemption. The Midrash relates the following:
In what merit do the people of Israel deserve this honor (the redemption)?

Jacob’s deep rooted connection to the Machpelah Cave is also expressed in many scholarly sources. They tell us that even Jacob purchased his part in the cave for a fantastic fortune: