You are to help your brothers until the LORD gives them rest, as he has done for you, and until they too have taken possession of the land that the LORD your God is giving them. After that, you may go back and occupy your own land, which Moses the servant of the LORD gave you east of the Jordan toward the sunrise.
Joshua 4:24
He did this so that all the peoples of the earth might know that the hand of the LORD is powerful and so that you might always fear the LORD your God.
Joshua 1:9
Have I not commanded you? Be strong and courageous. Do not be terrified; do not be discouraged, for the LORD your God will be with you wherever you go.