3 For a long time now—to this very day—you have not deserted your fellow Israelites but have carried out the mission the LORD your God gave you.

Read Joshua 22:3 Using Other Translations

Ye have not left your brethren these many days unto this day, but have kept the charge of the commandment of the LORD your God.
You have not forsaken your brothers these many days, down to this day, but have been careful to keep the charge of the LORD your God.
During all this time you have not deserted the other tribes. You have been careful to obey the commands of the LORD your God right up to the present day.