2 Samuel 4:6
And they came thither into the midst of the house, as though they would have fetched wheat; and they smote him under the fifth rib: and Rechab and Baanah his brother escaped. And they came thither into the midst of the house, as though they would have fetched wheat; and they smote him under the fifth rib: and Rechab and Baanah his brother escaped.
The verse records the treacherous murder of Ishbosheth by two of his own captains. They killed him by stealth within his own house and then cut off his head. They carried that head to David, hoping by the deed to win his favor.