Genesis 14:13-14

13But one of Lot’s men escaped and reported everything to Abram the Hebrew, who was living near the oak grove belonging to Mamre the Amorite. Mamre and his relatives, Eshcol and Aner, were Abram’s allies.

14When Abram heard that his nephew Lot had been captured, he mobilized the 318 trained men who had been born into his household. Then he pursued Kedorlaomer’s army until he caught up with them at Dan.