Jamieson, Fausset and Brown on 1 Samuel 30:6

6. David was greatly distressed--He had reason, not only on his own personal account (1Sa 30:5), but on account of the vehement outcry and insurrectionary threats against him for having left the place so defenseless that the families of his men fell an unresisting prey to the enemy. Under the pressure of so unexpected and widespread a calamity, of which he was upbraided as the indirect occasion, the spirit of any other leader guided by ordinary motives would have sunk;

but David encouraged himself in the Lord his God--His faith supplied him with inward resources of comfort and energy, and through the seasonable inquiries he made by Urim, he inspired confidence by ordering an immediate pursuit of the plunderers.