David therefore departed thence, and escaped to the cave Adullam: and when his brethren and all his father's house heard it, they went down thither to him.
David ... escaped to the cave Adullam - supposed to be that now called Deir-Dubb'an, a number of pits, or underground vaults, some nearly square, and all about fifteen or twenty feet deep, with perpendicular sides in the soft limestone or chalky rocks. They are on the borders of the Shephelah, or Philistine plain, at the base of the Judean mountains; placed by Eusebius and Jerome about Ramah, ten miles (about three and a half hours) east from Eleutheropolis (Beit-Jebrin). Psalms 14:1-7 was composed in that cave, well adapted for concealing a great number of refugees.
His brethren and all his fathers house ... went down - to escape the effects of Saul's rage, which seems to have extended to all David's family. From Beth-lehem to Deir-Dubb'an it is indeed a descent all the way (Robinson's 'Biblical Researches,' 2:, p. 175; 'Sinai and Palestine,' p. 254; Van de Velde, 2:, pp. 140, 157; Porter's 'Handbook,' pp. 229, 230: see the note at John 15:35).