Wesley's Notes on the Bible
And when Saul's son heard that Abner was dead in Hebron, his hands were feeble, and all the Israelites were troubled.
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:
And the Beerothites fled to Gittaim, and were sojourners there until this day.)
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.
4:4 Jonathan had a son - This history is inserted as that which encouraged these men to this wicked murder, because Saul's family was now reduced to a low ebb; and if Isbosheth was dispatched, there would be none left, but a lame child, who was altogether unfit to manage the kingdom, and therefore the crown must necessarily come to David by their act and deed; for which they promised themselves no small recompense. Jezreel - The place of that last and fatal fight.
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.
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.
4:6 Fetched wheat - Which was laid up in publick granaries in the king's house, and was fetched thence by the captains and commanders of the army for the pay of their soldiers, who, in those ancient times were not paid in money, but in corn. Upon this pretence they were admitted into the house, and so went from room to room, to the place where the king lay.
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.
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.
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,
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:
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?
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.
4:12 David commanded. and c.But what a disappointment to Baanah and Rechab, was the sentence which David passed upon them! And such they will meet with, who think to serve the Son of David, by cruelty or injustice: who under colour of religion, outrage or murder of their brethren, think they do God service. However men may now canonize such methods of serving the church and the catholic cause, Christ will let them know another day, that Christianity was not designed to destroy humanity. And they who thus think to merit heaven, shall not escape the damnation of hell.