Matthew Henry on 1 Samuel 22:20-23

David greatly lamented the calamity. It is great trouble to a good man to find himself any way the cause of evil to others. He must have been much pained, when he considered that his falsehood was one cause of this fatal event. David speaks with assurance of his own safety, and promises that Abiathar should have his protection. With the Son of David, all who are his may be sure they shall be in safeguard, Ps 91:1. In the hurry and distraction David was continually in, he found time for communion with God, and found comfort in it.