BETHBASI bĕth bā’ sī (Gr. Βαιθβασι), a village below Jerusalem mentioned in 1 Maccabees 9:62-64 which was fortified by Jonathan and Simon and which withstood a siege by Bacchides, the Hel. governor of the W Euphrates under King Demetrius I. His abortive invasion (158-157 b.c.) ended in peace for the Jews and the triumph of Jonathan. The town is tentatively identified with modern Khirbet Beit Bassa in the Judean wilderness.