Jim and Ramona Douglas
David's 400 Mighty Men - 1 Samuel 22
New International Version (©1984)... David left Gath and escaped to the cave of Adullam. When his brothers and his father's household heard about it, they went down to him there...
Jamieson-Fausset-Brown Bible Commentary ... David . escaped to the cave Adullam-supposed to be that now called Deir-Dubban, 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 Philistine plain at the base of the Judea mountains, six miles southwest from Beth-lehem, and well adapted for concealing a number of refugees. his brethren and all his father's 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-Dubban it is, indeed, a descent all the way.