Joshua 22:3
You have not forsaken your brothers these many days, down to this day, but have kept the charge of the commandment of the LORD your God — The phrase 'not forsaken your brothers' emphasizes covenant solidarity; military assistance to the western tribes binds them together despite geographical separation. The 'charge of the commandment' (mishmeret-miṣwat) indicates that military service itself is a covenant obligation, not merely a practical arrangement.