'League' in the Bible

And Abner sent messengers to David on his behalf, saying, Whose is the land? saying also , Make thy league with me, and, behold, my hand shall be with thee, to bring about all Israel unto thee.

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.