2 Samuel 4:5-9

5And the sons of Rimmon the Beerothite, Rechab and Baanah, went, and came about the heat of the day to the house of Ishbosheth, who lay on a bed at noon. 6And they came there 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. 7For when they came into the house, he lay on his bed in his bedchamber, and they smote him, and slew him, and beheaded him, and took his head, and went away through the plain all night. 8And they brought the head of Ishbosheth to David to Hebron, and said to the king, Behold the head of Ishbosheth the son of Saul thy enemy, who sought thy life; and the LORD hath avenged my lord the king this day of Saul, and of his seed.

9And David answered Rechab and Baanah his brother, the sons of Rimmon the Beerothite, and said to them, As the LORD liveth, who hath redeemed my soul out of all adversity,