2 Samuel 4:9-11

9David replied to Rechab and Baanah his brother, the sons of Rimmon the Beerothite, and said to them, “As the Lord lives, who has redeemed my life from every adversity,

10when a man told me, ‘Behold, Saul is dead,’ thinking that he was bringing good news, I seized and killed him in Ziklag, to reward him for his news.

11How much more, when wicked men have killed a righteous and just man in his own house on his bed, shall I not require his blood from your hand and remove you from the earth?”