Charles Ellicott Commentary 1 Samuel 25:33

"and blessed be thy discretion, and blessed be thou, that hast kept me this day from bloodguiltiness, and from avenging myself with mine own hand." — 1 Samuel 25:33 (ASV)

And blessed be thy advice. —David, with his usual frank generosity, admits he was in the wrong in giving way to wild, ungovernable passion, and openly confesses that if Abigail had not met him and reasoned with him, he would have carried out his purpose, and stained his fair fame forever with a terrible crime. His dark purpose was to cut off, root and branch, the whole house of Nabal, among others the woman standing before him there. It is noticeable how, in this age of deeper religion and of higher culture, the old superstitious reverence for vows, taken in moments of frenzy or of extreme excitement, had given way to a calmer and more reasonable spirit.

Never had a more solemn vow been taken than David’s that morning, when he took a solemn oath that he would murder the whole house of Nabal; and yet, before the sun set, he was convinced of the wickedness of his purpose, and sooner than carry it out, he deliberately broke the oath. Some years before, Saul—had he not been forcibly hindered by the people—would, by the murder of his son, the hero-prince Jonathan, have fulfilled the rash oath which he swore at the battle of Michmash (1 Samuel 14:24; 1 Samuel 14:45); and Jephthah, the judge of Israel, we know, through his beloved daughter, ruthlessly carried out his wild, useless oath (Judges 11:34; Judges 11:40).