NET
4 Prepare yourselves by your families according to your divisions, as instructed in writing by King David of Israel and his son Solomon.
Darby
4 and prepare yourselves by your fathers' houses, in your divisions, according to the writing of David king of Israel, and according to the writing of Solomon his son;
KJV
4 And prepare [yourselves] by the houses of your fathers, after your courses, according to the writing of David king of Israel, and according to the writing of Solomon his son.