2 Samuel 3:13

And he said, Well; I will make a league with thee David agreed to enter into a treaty with him, but upon condition that he procured the restitution of Michal his wife. Hereby David both showed the sincerity of his conjugal affection to his first and most rightful wife, from whom neither her nor his marrying another had alienated it, and also testified his respect to the house of Saul. “David did right in making this stipulation; for, whatever may be said of his other wives, he had certainly a claim to this, as she was his first wife, and a king's daughter. And there was something of true generosity in this, both to her and to Saul, in that he received her after she had been another man's, remembering how once she loved him, and knowing, probably, that she was, without her consent, separated from him; and to show that he did not carry his resentment of Saul's cruel and unjust persecutions of him to any of his family; whereas many princes, for much less provocation of a wife's father, would have turned off their consorts, in revenge of them, and even put them to death for having been married to another.” Chandler.