And he inquired of the LORD for him, and gave him victuals, and gave him the sword of Goliath the Philistine.

Wesley's Notes

22:10 He enquired - David chargeth him with the sin of lying, Psal 52:3, and it is not improbable, that he told many lies not here expressed; and withal, he was guilty of concealing part of the truth, which in this case he was obliged to declare for Ahimelech's just defence, namely, the artifice whereby David circumvented Ahimelech: making him believe, that he was then going upon the king's business, so that the service he did to David, was designed in honour to Saul.

Jamieson-Fausset-Brown Bible Commentary

10. he inquired of the Lord for him-Some suppose that this was a malicious fiction of Doeg to curry favor with the king, but Ahimelech seems to acknowledge the fact. The poor simple-minded high priest knew nothing of the existing family feud between Saul and David. The informer, if he knew it, said nothing of the cunning artifice by which David obtained the aid of Ahimelech. The facts looked against him, and the whole priesthood along with him were declared abettors of conspiracy [1Sa 22:16, 17].

Matthew Henry's Concise Commentary

22:6-19 See the nature of jealous malice and its pitiful arts. Saul looks upon all about him as his enemies, because they do not just say as he says. In Ahimelech's answer to Saul we have the language of conscious innocence. But what wickedness will not the evil spirit hurry men to when he gets the dominion! Saul alleges that which was utterly false and unproved. But the most bloody tyrants have found instruments of their cruelty as barbarous as themselves. Doeg, having murdered the priests, went to the city, Nob, and put all to the sword there. Nothing so vile but those may do it, who have provoked God to give them up to their hearts' lusts. Yet this was the accomplishment of the threatenings against the house of Eli. Though Saul was unrighteous in doing this, yet God was righteous in permitting it. No word of God shall fall to the ground.