The descendants of Esau are well documented from Egyptian sources that corroborate the biblical account.
Rebekah was the original inventor of the plot for Isaac to give Jacob the blessing rather than Esau after Jacob had extorted Esau’s birthright. By deceit they fulfilled God’s will. The Bible shows how sinful man can still fulfill God’s purpose.
Of particular interest is Ishmael’s second son, Kedar. His name is closely associated with Arabia. But Kedar lived much closer to Jerusalem than what the Muslims suggest. They claim he moved to what is now Mecca, but according to Isaiah 60:7 he must have lived much closer.
All Kedar’s flocks will be gathered to you,
the rams of Nebaioth will serve you;
they will be accepted as offerings on my altar,
and I will adorn my glorious temple.
The lambs and other animals used for sacrifices were raised much nearer Jerusalem so they could more easily be driven as herds.