'Be Strong' in the Bible

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

Be strong and of a good courage, fear not, nor be afraid of them: for the LORD your God, he it is that does go with you; he will not fail you, nor forsake you.

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

And he gave Joshua the son of Nun a charge, and said, Be strong and of a good courage: for you shall bring the children of Israel into the land which I swore unto them: and I will be with you.