Matthew Henry on 1 Samuel 22:1-5
Here, I. David shelters himself in the cave of Adullam, Sa1 22:1. Whether it was a natural or artificial fastness does not appear; it is probable that the access to it was so difficult that David thought himself able, with Goliath's sword, to keep it against all the forces of Saul, and therefore buried himself alive in it, while he was waiting to see (and he says here, Sa1 22:3) what God would do with him. The promise of the kingdom implied a promise of preservation to it, and yet David used proper means for his own safety, otherwise he would have tempted God. He did not do any thing that aimed to destroy Saul, but only to secure himself. He that might have done great service to his country…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Samuel 22:3
David went thence to Mizpeh of Moab--"Mizpeh" signifies a watchtower, and it is evident that it must be taken in this sense here, for it is called "the hold" or fort (Sa1 22:4). The king of Moab was an enemy of Saul (Sa1 14:47), and the great-grandson of Ruth, of course, was related to the family of Jesse. David, therefore, had less anxiety in seeking an asylum within the dominions of this prince than those of Achish, because the Moabites had no grounds for entertaining vindictive feelings against him, and their enmity, to Saul rendered them the more willing to receive so illustrious a refugee from his court.
Adam Clarke on 1 Samuel 22:3
He said unto the king of Moab - David could not trust his parents within the reach of Saul, and he found it very inconvenient to them to be obliged to go through all the fatigues of a military life, and therefore begs the king of Moab to give them shelter. The king of Moab, being one of Saul's enemies, would be the more ready to oblige a person from whom he might at least expect friendship, if not considerable services.
John Gill on 1 Samuel 22:4
And he brought them before the king of Moab,.... Having leave from him for it, and left them with him; so the Targum,"caused them to remain before him:"
and they dwelt with him all the whole time that David was in the hold; either in the cave of Adullam, as some think; or rather at Mizpeh in Moab, which might be a fortified place; or the sense may be, while he was in any hold in those parts, as he might go from one to another; what became of David's parents afterwards, we nowhere else read. The Jews (z) say the king of Moab slew his father and his mother, and his brethren, all but one, whom Nahash the Ammonite preserved; and is the kindness David speaks of, 2 Samuel 10:2; and if this was th…