'Be Strong' in the Bible

Therefore you shall keep all the commandment which I command you this day, that you may be strong, and go in and possess the land, where you go over to possess it;

Be strong and courageous, do not be afraid, nor be scared of them: for the LORD your God, he it is who does go with you; he will not fail you, nor forsake you."

Moses called to Joshua, and said to him in the sight of all Israel, "Be strong and courageous: for you shall go with this people into the land which the LORD has sworn to their fathers to give them; and you shall cause them to inherit it.

He commissioned Joshua the son of Nun, and said, "Be strong and courageous; for you shall bring the children of Israel into the land which I swore to them: and I will be with you."