Genesis 13:18

13:18 So Abram moved his tents and went to live by the oaks of Mamre in Hebron, and he built an altar to the Lord there.

Genesis 14:13

14:13 A fugitive came and told Abram the Hebrew. Now Abram was living by the oaks of Mamre the Amorite, the brother of Eshcol and Aner. (All these were allied by treaty with Abram.)