2 Samuel 4:4-8

Now Jonathan, Saul’s son, had a son who was disabled in both feet. He was five years old when the news of Saul and Jonathan came from Jezreel, and his nurse picked him up and fled. But it happened that in her hurry to flee, he fell and could no longer walk. And his name was Mephibosheth.

So the sons of Rimmon the Beerothite, Rechab and Baanah, departed and came to the house of Ish-bosheth in the heat of the day, while he was taking his midday rest.

And they came to the interior of the house as if to get wheat, and they struck him in the belly; and Rechab and his brother Baanah escaped.

Now when they had come into the house, as he was lying on his bed in his bedroom, they struck him and killed him, and they beheaded him. And they took his head and traveled by way of the Arabah all night.

Then they brought the head of Ish-bosheth to David at Hebron, and said to the king, “Behold, the head of Ish-bosheth the son of Saul, your enemy, who sought your life; so the Lord has given my lord the king vengeance this day on Saul and his descendants.”