In response to what Rootsie wrote "Abraham was not a Hebrew because there were no Hebrews yet." Abraham was a descendant of Eber.

Genesis Chapter 11:10-26

11:10 These are the generations of Shem: Shem was an hundred years old, and begat Arphaxad two years after the flood:
11:11 And Shem lived after he begat Arphaxad five hundred years, and begat sons and daughters.
11:12 And Arphaxad lived five and thirty years, and begat Salah:
11:13 And Arphaxad lived after he begat Salah four hundred and three years, and begat sons and daughters.
11:14 And Salah lived thirty years, and begat Eber:
11:15 And Salah lived after he begat Eber four hundred and three years, and begat sons and daughters.
11:16 And Eber lived four and thirty years, and begat Peleg:
11:17 And Eber lived after he begat Peleg four hundred and thirty years, and begat sons and daughters.
11:18 And Peleg lived thirty years, and begat Reu:
11:19 And Peleg lived after he begat Reu two hundred and nine years, and begat sons and daughters.
11:20 And Reu lived two and thirty years, and begat Serug:
11:21 And Reu lived after he begat Serug two hundred and seven years, and begat sons and daughters.
11:22 And Serug lived thirty years, and begat Nahor:
11:23 And Serug lived after he begat Nahor two hundred years, and begat sons and daughters.
11:24 And Nahor lived nine and twenty years, and begat Terah:
11:25 And Nahor lived after he begat Terah an hundred and nineteen years, and begat sons and daughters.
11:26 And Terah lived seventy years, and begat Abram, Nahor, and Haran

(from Eastman Bible Dictionary)

Eber - beyond. (1.). The third post-diluvian patriarch after Shem (Gen. 10:24; 11:14). He is regarded as the founder of the Hebrew race (10:21; Num. 24:24). In Luke 3:35 he is called Heber.

(From the Book of Genesis)

10:22 The children of Shem; Elam, and Asshur, and Arphaxad, and Lud, and Aram.
10:23 And the children of Aram; Uz, and Hul, and Gether, and Mash.
10:24 And Arphaxad begat Salah; and Salah begat Eber.
10:25 And unto Eber were born two sons: the name of one was Peleg; for in his days was the earth divided; and his brother's name was Joktan.

So you see the Hebrews were before Abraham and Abraham was a Hebrew!!!!