2 Samuel 3:13
And he said, Well; I will make a league with thee: but one thing I require of thee, that is, Thou shalt not see my face, except thou first bring Michal Saul’s daughter, when thou comest to see my face. And he said, Well; I will make a league with thee: but one thing I require of thee, that is, Thou shalt not see my face, except thou first bring Michal Saul’s daughter, when thou comest to see my face.
David agreed to Abner's proposal to bring the allegiance of all the tribes of Israel over to his own kingship. He entered into that league with Abner as the appointed means of uniting the nation under his rule. He then dismissed Abner with honor to go and carry out the work of gathering Israel to him.