the sword. Put by Figure of speech Metonymy (of Adjunct), App-6, for manifested hostility.
never. Figure of speech Synecdoche (of the Whole), App-6, put for. part of time: i.e. lifetime.
Related Commentaries of 2 Samuel 12:10
2 Samuel 12:10
10 Now therefore the sword shall never depart from thine house; because thou hast despised me, and hast taken the wife of Uriah the Hittite to be thy wife.