Genesis 14:24

Save only that which the young men have eaten, and the portion of the men which went with me, Aner, Eshcol, and Mamre; let them take their portion.

Genesis 14:13

And there came one that had escaped, and told Abram the Hebrew(1); for he dwelt in [by] the plain of Mamre [Alon Mamre, terebinth trees of Mamre] the Amorite, brother of Eshcol, and brother of Aner: and these [were] confederate [allies] with Abram.

(1)According to KJV, This is the first time the word Hebrew is used, and it references Genesis 13:18, which tells of Abraham dwelling in Hebron.