Genesis 14:13-14

One who escaped came to Abram the Hebrew and told him what had happened to Lot. Abram was living by the oaks of Mamre the Amorite. Mamre had two brothers, Eshcol and Aner, who were allied by treaty with Abram. When Abram heard that his nephew Lot had been taken captive by the four kings, he mobilized all the men in his camp, 318 in all who had been born and trained in his own household, and he pursued the invaders as far north as Dan.