Adam Clarke on 1 Samuel 24:22

Saul went home - Confounded at a sense of his own baseness, and overwhelmed with a sense of David's generosity.

David and his men gat them up unto the hold - Went up to Mizpeh, according to the Syriac and Arabic. David could not trust Saul with his life; the utmost he could expect from him was that he should cease from persecuting him; but even this was too much to expect from a man of such a character as Saul. He was no longer under the Divine guidance; an evil spirit had full dominion over his soul. What God fills not, the devil will occupy.