The Scofield Bible Commentary, by Cyrus Ingerson Scofield, , at sacred-texts.com
See (Gen 12:3); (Gen 15:18); See note 3,(5),
(See Scofield) - (Gen 15:18).
Esau wept because of a lost advantage, but "found no way to change his mind, though he sought it carefully with tears" (Heb 12:17) so far may regret or remorse be from true repentance:
(Gen 26:34); (Gen 26:35).
Heth was ancestor of the Hittites.