2 Samuel 3:12, 13, 21

Then Abner sent messengers on his behalf to say to David, “Whose land is it? Make an agreement with me, and I will help you bring all Israel over to you.”

“Good,” said David. “I will make an agreement with you. But I demand one thing of you: Do not come into my presence unless you bring Michal daughter of Saul when you come to see me.”

Then Abner said to David, “Let me go at once and assemble all Israel for my lord the king, so that they may make a covenant with you, and that you may rule over all that your heart desires.” So David sent Abner away, and he went in peace.