2 Samuel 3:12-13

12Abner sent messengers as his representatives to say to David, “Whose land is it? Make your covenant with me, and you can be certain I am on your side to turn all Israel over to you.”

13David replied, “Good, I will make a covenant with you. However, there’s one thing I require of you: You will not see my face unless you first bring Saul’s daughter Michal when you come to see me.”