Genesis 14:13 - The Popular Commentary by Paul E. Kretzmann

And there came one that had escaped, and told Abram, the Hebrew; for he dwelt in the plain of Mamre, the Amorite, brother of Eshcol, and brother of Aner; and these were confederate with Abram. Abram, living at some distance from the scene of all these happenings, was not aware of the straits into which Lot had fallen, until a fugitive from the battle brought him the news. He was known as the Hebrew, the immigrant from the other side of the Euphrates, and he was still living in the grove of terebinths which belonged to Mamre, the Amorite.