2 Samuel 4:4 (KJV)

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.

And the sons of Rimmon the Beerothite, Rechab and Baanah, went, and came about the heat of the day to the house of Ish–bosheth, 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.