Gezer

a precipice, an ancient royal Canaanitish city (Josh 10:33 ; 12:12). It was allotted with its suburbs to the Kohathite Levites (Josh 21:21 ; 1Chr 6:67 ). It stood between the lower Beth-horon and the sea (Josh 16:3 ; 1Kings 9:17). It was the last point to which David pursued the Philistines (2Sam 5:25 ; 1Chr 14:16 ) after the battle of Baal-perazim. The Canaanites retained possession of it till the time of Solomon, when the king of Egypt took it and gave it to Solomon as a part of the dowry of the Egyptian princess whom he married (1Kings 9:15-17). It is identified with Tell el-Jezer, about 10 miles south-west of Beth-horon. It is mentioned in the Amarna tablets.

EBD - Easton's Bible Dictionary