2 Samuel 4:5-8

5So the sons of Rimmon the Beerothite, Rechab and Baanah, left and came to the house of Ish-bosheth in the heat of the day while he was taking his midday rest.

6They came into the interior of the house as if to get wheat [for the soldiers], and they struck him in the stomach. Then Rechab and Baanah his brother escaped [unnoticed].

7Now when they entered the house he was lying on his bed in his bedroom. They [not only] struck and killed him, [but] they also beheaded him. Then they took his head and traveled all night by way of the Arabah.

8They brought the head of Ish-bosheth to David at Hebron, and said to the king, “Look, the head of Ish-bosheth the son of Saul, your enemy, who sought your life; thus the Lord has granted my lord the king vengeance this day on Saul and on his descendants.”