2 Samuel 4:5-7

5And the sons of Rimmon the Beerothite, Rechab and Baanah, went and came in about the heat of the day into the house of Ishbosheth, who was taking his noonday rest.

6And they came thither into the midst of the house, [as though] they would fetch wheat; and they smote him in the belly; and Rechab and Baanah his brother escaped.

7They came into the house, as he lay on his bed in his bedchamber, and they smote him, and slew him, and beheaded him; and they took his head, and went by the way of the plain all night.