2 Samuel 3:37 (BSB)

So on that day all the troops and all Israel were convinced that the king had no part in the murder of Abner son of Ner.

From 2 Samuel 3. Also in the ESV.

Commentary on 2 Samuel 3:37

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 2 Samuel 3:22-39: We have here an account of the murder of Abner by Joab, and David's deep resentment of it. I. Joab very insolently fell foul upon David for treating with Abner. He happened to be abroad upon service when Abner was with David, pursuing a troop, either of Philistines or of Saul's party; but, upon his return, he was informed that Abner was just gone (Sa2...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 2 Samuel 3:37: For all the people and all Israel understood that day,.... Not the people of Judah only, but of Israel also, to whom the knowledge of these things came; they knew and were satisfied by his conduct and behaviour, by his words and actions: that it was not of the king to slay Abner the son of Ner; it was not by the counsel or advice...
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on 2 Samuel 3:6-39: 2Sa 3:6-39 Decline of the House of Saul. - 2Sa 3:6-11. Abner’s quarrel with Ishbosheth. - During the war between the house of Saul and the house of David, Abner adhered firmly to the house of Saul, but he appropriated one of Saul’s concubines to himself.