1 Samuel 22:1

To the cave Adullam - Or rather “of Adullam.” Adullam was the name of a town of Judah in the “Shephelah,” not far from Bethlehem, and below it. Innumerable caverns, one nearly 100 feet long, are excavated in the soft limestone hills in the neighborhood of Beit-Jibrin. (The cave is placed by Ganneau and Conder on the hill (500 feet high) over ‘Aid el Ma or Miyeh.) David’s brethren and kinsmen joined him partly from sympathy with him, and partly because their own lives were in jeopardy front Saul’s furious enmity.