1 Samuel 19:2 - Joseph Benson’s Commentary on the Old and New Testaments

But Jonathan delighted much in David, and told David Jonathan disobeyed the command, and, instead of murdering David, pleads his innocence and merits, as reasons for saving him. He also discovered his father's design and fixed resolution to destroy him, and certainly in neither case acted inconsistently with his duty to his father, and king. “He,” says Dr. Dodd, “who knows of a conspiracy against an innocent person's life, and doth not discover it; or, who kills such a one by another's instigation and command, is himself a murderer; and no duty to a father, or allegiance to a prince, can oblige any one to shed innocent blood. Jonathan was therefore so far from acting contrary to his duty and allegiance, in refusing to become his father's instrument in murdering David, that he gave a noble instance of filial piety, affection, and duty, in his repeated endeavours to preserve him from so unnatural a crime; and humanity and virtue will ever applaud him for the generous concern he expressed for the honour of his father and the preservation of his friend.” Take heed to thyself until the morning Jonathan knew not but some of the servants might be either so obsequious to Saul, or so envious at David, as to put the orders in execution which Saul had given, if they could light on David.