2 Samuel 4
And when Saul's son heard that Abner was dead in Hebron, his hands were feeble, and all the Israelites were troubled.
2 And Saul's son had two men that were captains of bands: the name of the one was Baanah, and the name of the other Rechab, the sons of Rimmon a Beerothite, of the children of Benjamin: (for Beeroth also was reckoned to Benjamin.
3 And the Beerothites fled to Gittaim, and were sojourners there until this day.)
4 And Jonathan, Saul's son, had a son that was lame of his feet. He was five years old when the tidings came of Saul and Jonathan out of Jezreel, and his nurse took him up, and fled: and it came to pass, as she made haste to flee, that he fell, and became lame. And his name was Mephibosheth.
5 And 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.
6 And they came thither 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.
7 For 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 gat them away through the plain all night.
8 And they brought the head of Ishbosheth unto David to Hebron, and said to the king, Behold the head of Ishbosheth the son of Saul thine enemy, which sought thy life; and the Lord hath avenged my lord the king this day of Saul, and of his seed.
9 And David answered Rechab and Baanah his brother, the sons of Rimmon the Beerothite, and said unto them, As the Lord liveth, who hath redeemed my soul out of all adversity,
10 When one told me, saying, Behold, Saul is dead, thinking to have brought good tidings, I took hold of him, and slew him in Ziklag, who thought that I would have given him a reward for his tidings:
11 How much more, when wicked men have slain a righteous person in his own house upon his bed? shall I not therefore now require his blood of your hand, and take you away from the earth?
12 And David commanded his young men, and they slew them, and cut off their hands and their feet, and hanged them up over the pool in Hebron. But they took the head of Ishbosheth, and buried it in the sepulchre of Abner in Hebron.
Public Domain KJV text from Wordproject.org
Two sons of Rimmon the Beerothite killed Ishbosheth at his bed and beheaded him. Then they took the head of Ishbosheth and came to see David, thinking they were bringing good tidings. But David could not honor such an act of treachery as a means of elevating him to the position of king over all Israel. He ordered the two murderous captains to be executed. In doing so, David showed that he considered Ishbosheth “a righteous person” and buried him with dignity. The death and burial of Ishbosheth marked the collapse of the northern kingdom and brought David nearer to being the king over Israel and Judah.
One may notice the inconsistency of David in dealing with Ishbosheth’s murderers on the one hand and with his own nephew Joab who had murdered Abner on the other. David seemed to be weak in dealing with his own family members fairly and squarely. This tendency was also seen in David’s later dealings with the rebellion and death of his own son Absalom. It is never honest to deal differently with evil persons because they are family members.