C. F. Keil and Franz Delitzsch on Genesis 23:20

Gen 23:20

The repetition of the statement, that the field with the cave in it was conveyed to Abraham by the Hittites for a burial-place, which gives the result of the negotiation that has been described with, so to speak, legal accuracy, shows the great importance of the event to the patriarch. The fact that Abraham purchased a burying-place in strictly legal form as an hereditary possession in the promised land, was a proof of his strong faith in the promises of God and their eventual fulfilment. In this grave Abraham and Sarah, Isaac and Rebekah, were buried; there Jacob buried Leah; and there Jacob himself requested that he might be buried, thus declaring his faith in the promises, even in the hour of his death.