'Be Strong' in the Bible

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

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

And Moses called to Joshua, and said to him in the sight of all Israel, Be strong and of a good courage: for thou must go with this people to the land which the LORD hath sworn to their fathers to give them; and thou shalt 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 thou shalt bring the children of Israel into the land which I swore to them: and I will be with thee.