Commentaries:
Jamieson, Fausset, and Brown
the spear that is at his bolster, and the cruse of water—The Oriental spear had, and still has, a spike at the lower extremity, intended for the purpose of sticking the spear into the ground when the warrior is at rest. This common custom of Arab sheiks was also the practice of the Hebrew chiefs.
at his bolster—literally, "at his head"; perhaps, Saul as a sovereign had the distinguished luxury of a bolster carried for him. A "cruse of water" is usually, in warm climates, kept near a person's couch, as a drink in the night time is found very refreshing. Saul's cruse would probably be of superior materials, or more richly ornamented than common ones, and therefore by its size or form be easily distinguished.
Then said Abishai to David, God hath delivered thine enemy into thine hand—This midnight stratagem shows the activity and heroic enterprise of David's mind, and it was in unison with the style of warfare in ancient times.
let me smite him . . . even to the earth at once—The ferocious vehemence of the speaker is sufficiently apparent from his language, but David's magnanimity soared far above the notions of his followers. Though Saul's cruelty and perfidy and general want of right principle had sunk him to a low pitch of degradation, yet that was no reason for David's imitating him in doing wrong. Besides, he was the sovereign; David was a subject. Though God had rejected him from the kingdom, it was in every way the best and most dutiful course, instead of precipitating his fall by imbruing their hands in his blood and thereby contracting the guilt of a great crime, to wait the awards of that retributive providence which sooner or later would take him off by some sudden and mortal blow. He who, with impetuous haste was going to exterminate Nabal, meekly spared Saul. But Nabal refused to give a tribute to which justice and gratitude, no less than custom, entitled David. Saul was under the judicial infatuation of heaven. Thus David withheld the hand of Abishai; but, at the same time, he directed him to carry off some things which would show where they had been, and what they had done. Thus he obtained the best of victories over him, by heaping coals of fire on his head.
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