Gen 27:26-29, Rom 9:10-13, Mal 1:2
It was prophesied that Jacob would become a stronger people than Esau. (Genesis 25:22-23)
Genesis 25:22 And the children struggled together within her; and she said, If it be so, why am I thus? And she went to enquire of the Lord. 23 And the Lord said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger.
Isaac blesses Jacob to occupy the land where Christ will come and prophesies that Christ will come as Jacob's descendant. (Gen 27:26-29)
Gen 27:26 And his father Isaac said unto him, Come near now, and kiss me, my son. 27 And he came near, and kissed him: and he smelled the smell of his raiment, and blessed him, and said, See, the smell of my son is as the smell of a field which the Lord hath blessed: 28 Therefore God give thee of the dew of heaven, and the fatness of the earth, and plenty of corn and wine: 29 Let people serve thee, and nations bow down to thee: be lord over thy brethren, and let thy mother's sons bow down to thee: cursed be every one that curseth thee, and blessed be he that blesseth thee.
God loved Jacob more than Esau because God had chosen to send Christ as the descendant of Jacob. (Rom 9:10-13, Mal 1:2)
Rom 9:10 And not only this; but when Rebecca also had conceived by one, even by our father Isaac; 11 (For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth;) 12 It was said unto her, The elder shall serve the younger. 13 As it is written, Jacob have I loved, but Esau have I hated.
Mal 1:2 I have loved you, saith the Lord. Yet ye say, Wherein hast thou loved us? Was not Esau Jacob's brother? saith the Lord: yet I loved Jacob,