Rezin (rç'zin), stable, firm. 1. King of Damascus: allied himself with Pekah and defeated Ahaz, but was himself defeated by Tiglath-pileser II., his capital destroyed and his people carried away into captivity. 2 Kings 15:37; 2 Kings 16:5-9; Isaiah 7:1-8; Isaiah 8:6; Isaiah 9:11. 2. One whose descendants returned with Zerubbabel. Ezra 2:48; Nehemiah 7:50.