2 Samuel 4:9-11

9Then David answered Rechab and his brother Baanah, sons of Rimmon the Beerothite, saying to them, “As Adonai lives, who redeemed my soul out of all distress,

10when someone informed me saying, ‘Look, Saul is dead!’ thinking he was a bearer of good news, I seized him and killed him in Ziklag, instead of rewarding him for his news.

11How much more, when wicked men have killed a righteous person in his own house and on his bed! Should I not now require his blood from your hands and rid the earth of you?”