2 Samuel 4:7-8

7They had entered the house while Ish-bosheth was lying on his bed, and having stabbed and killed him, they beheaded him, 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, “Here is the head of Ish-bosheth son of Saul, your enemy who sought your life. Today the LORD has granted vengeance to my lord the king against Saul and his offspring.”