2 Samuel 4:7-8

7They had gone into the house while he was lying on the bed in his bedroom. After they stabbed and killed him, they cut off his head. Taking it with them, they traveled all night by way of the Arabah.

8They brought the head of Ish-Bosheth to David at Hebron and said to the king, “Here is the head of Ish-Bosheth son of Saul, your enemy, who tried to kill you. This day the Lord has avenged my lord the king against Saul and his offspring.”