Genesis 12:8

(8) He removed.—Broke up his encampment. No special reason for this need be sought; it was the usual condition of the nomad life, and Abram’s wealth in cattle would make frequent changes necessary. His first long halt was in the hill country between Beth-el and Hai, or rather Ai, as in Joshua 8:1-3. The numerous almond-trees, whence the former town took its early name of Luz, the remains of aqueducts and other works for irrigation, and the strength of the town of Ai in Joshua’s days bear witness to the ancient fertility of the district, though said now to be uninviting. Here, too, Abram made open profession of his faith, and worshipped with his household at an altar dedicated to Jehovah.