Genesis 27:37

And Isaac answered and said unto Esau
Giving an account of the blessing be had bestowed upon his brother: behold, I have made him thy lord;
the lord of his posterity, who would be subdued and become tributary to his seed: and all his brethren have I given to him for servants;
the Edomites, who sprung from his brother Esau, who, according to this prophetic blessing, became servants to David, who was a son of Jacob's, (See Gill on Genesis 27:29); and with corn and wine have I sustained him;
promised him a fruitful country, the land of Canaan, abounding with all good things, particularly with corn and wine, which are put for all the rest: and what shall I do now unto thee, my son?
what is there remains? what can be bestowed upon thee? there is nothing left; dominion over others, even over all nations, yea, over thyself and thy posterity, and plenty of all good things, are given already to Jacob; what is there to be done for thee, or thou canst expect?