Samuel
2 Samuel 2:12ESV·traditional attribution

Abner the son of Ner, and the servants of Ish-bosheth the son of Saul, went out from Mahanaim to Gibeon.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A rivalship between two kings - David, whom God made king, and Ishbosheth, whom Abner made king. One would have thought, when Saul was slain, and all his sons that had sense and spirit enough to take the field with him, David would come to the throne without any opposition, since all Israel knew, not only how he had signalized himself, but...

Commenting on 2 Samuel 2:8-17

John Gill Reformed Baptist @doctorgill

And Abner the son of Ner,.... Who was before captain of Saul's host, and now of Ishbosheth's: and the servants of Ishbosheth the son of Saul; who seem to be not only his domestic servants, that waited upon him, or his courtiers, but his whole army by what follows: went out from Mahanaim to Gibeon; came from the city on the other side Jordan, where...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Abner . . . and the servants of Ish-bosheth . . . went out from Mahanaim to Gibeon--This town was near the confines of Judah, and as the force with which Abner encamped there seemed to have some aggressive design, David sent an army of observation, under the command of Joab, to watch his movements.