The Scofield Bible Commentary, by Cyrus Ingerson Scofield, , at sacred-texts.com
Compare (Gen 33:19); (Gen 50:13); (Jos 24:32); (Act 7:15); (Act 7:16).
A discrepancy in these statements has been fancied. It disappears entirely before the natural supposition that in the interval of about eighty years between the purchase by Abraham of the family sepulchre (Gen 23:4-20) and Jacob's purchase (Gen 33:19); the descendants of Hamor (or "Emmor," (Act 7:15); (Act 7:16) had resumed possession of the field in which the burial cave was situated. Instead of asserting an ancient title by inheritance, Jacob repurchased the field. Heth was the common ancestor.
(See Scofield) - (Gen 23:4).