1 Samuel 19:1,2

Saul spake to Jonathan— Jonathan, when Saul ordered him to kill David, disobeyed the command, and, instead of murdering him, pleaded his innocence and merits as reasons for saving him. He also disclosed to David his father's design and fixed resolution to destroy him; and, in my judgment, neither was inconsistent with his duty and allegiance to his father and king. He who knows of a conspiracy against an innocent person's life, and does 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, nor 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 and atrocious a crime; and piety and virtue will ever applaud him for the generous concern that he expressed for the honour of his father, and the preservation of his friend. The reader will observe, that Jonathan ever considers David as an innocent person, and pleads for him to his father, not as a rebel or notorious offender, to obtain his pardon, but as having never done any thing to forfeit Saul's favour, or his own life; and therefore Jonathan must be commended in disobeying his father's order, and doing all he can to prevent his purpose to kill him.