'Be Strong' in the Bible

Then shall you prosper, if you take heed to fulfill the statutes and judgments which the LORD charged Moses with concerning Israel: be strong, and of good courage; dread not, nor be dismayed.

Take heed now; for the LORD has chosen you to build a house for the sanctuary: be strong, and do it.

And David said to Solomon his son, Be strong and of good courage, and do it: fear not, nor be dismayed: for the LORD God, even my God, will be with you; he will not fail you, nor forsake you, until you have finished all the work for the service of the house of the LORD.