2 Samuel 4:9-11

And David made answer to Rechab and his brother Baanah, the sons of Rimmon the Beerothite, and said to them, By the living Lord, who has kept me safe from all my trouble, When one came to me with the news of Saul's death, in the belief that it would be good news, I took him and put him to death in Ziklag, which was the reward I gave him for his news: How much more, when evil men have put an upright person to death, in his house, sleeping on his bed, will I take payment from you for his blood, and have you cut off from the earth?