Esau was Jacob’s brother. Although he was the first born he did not inherit the birthright. Esau didn’t even care about it. He sold it to Jacob for a mere pot of soup. Esau violated the laws of God and took foreign wives, namely Hittite and Hivite women. While the jews of today are of Esau-Edom, they are descendants of many other foreign nations that God said were cursed, all dating back to Cain, and ultimately, the adversary, That Old Dragon, Satan.

Josephus

“Hyrcanus took also Dora and Marissa, cities of Idumea, and subdued all the Idumeans; and permitted them to stay in that country, if they would circumcise their genitals, and make use of the laws of the Jews; and they were so desirous of living in the country of their forefathers, that they submitted to the use of circumcision, and of the rest of the Jewish ways of living; at which time therefore this befell them, that they were hereafter no other than Jews.”

Antiquities of the Jews [Judeans] by Flavius Josephus
Book 13, Chapter 9, Paragraph 1

Strabo

“The western extremities of Judæa towards Casius are occupied by Idumæans, and by the lake [Sirbonis]. The Idumæans are Nabatæans. When driven from their country634 by sedition, they passed over to the Jews, and adopted their customs.635 The greater part of the country along the coast to Jerusalem is occupied by the Lake Sirbonis, and by the tract contiguous to it; for Jerusalem is near the sea, which, as we have said,636 may be seen from the arsenal of Joppa.637 These districts (of Jerusalem and Joppa) lie towards the north; they are inhabited generally, and each place in particular, by mixed tribes of Egyptians, Arabians, and Phœnicians. Of this description are the inhabitants of Galilee, of the plain of Jericho, and of the territories of Philadelphia and Samaria,638 surnamed Sebaste by Herod;639 but although there is such a mixture of inhabitants, the report most credited, [one] among many things believed respecting the temple [and the inhabitants] of Jerusalem, is, that the Egyptians were the ancestors of the present Jews.”

The Geography of Strabo, Volume III
Book 16 (Vol III), Chapter 2, Paragraph 34 (page 177)

Jewish encyclopedia

“EDOM (IDUMEA): Country in SE Palestine, also called Mount Seir. Its terrain was mountainous and easily fortified and its land was fertile. Elay S of the Dead Sea and bordered on the Red Sea at Elath and Ezion Geber. The Edomites were of Semitic origin, traditionally descendants of Esau, and lived by hunting. They dispossessed the Horite inhabitants of Seir and organized themselves along tribal lines headed by chieftain (called allooph), later consolidating into a monarchy. The Edomites were traditional enemies of the Israelites; they fought Saul and were defeated by David who partly annexed the land. The Edomites regained their independence during the reign of Jehoram, but the wars between the two states were frequent. In the 8th cent. BCE, the Edomites became vassals of Assyria. At the time of the destruction of the First Temple, they plundered and looted in association with the Babylonians, and, being driven out from Seir by the Nabateans, occupied S Judah during or after the period of the Exile. The Edomites were conquered by John Hyrcanus who forcibly converted them to Judaism, and from then on they constituted a part of the Jewish people, Herod being one of their descendants.”

– The Standard Jewish encyclopedia. Cecil Roth, editor-in-chief by Roth, Cecil, 1899-1970 Publication date 1962. page 592-593 (pg. 322 on archive.org)