'Be Strong' in the Bible

Be strong, and let us shew ourselves valiant for our people, and for the cities of our God; and Jehovah will do what is good in his sight.

Then shalt thou prosper, if thou takest heed to perform the statutes and ordinances which Jehovah commanded Moses for Israel: be strong and courageous; fear not, neither be dismayed.

Consider now, that Jehovah has chosen thee to build a house for the sanctuary: be strong, and do it.

And David said to Solomon his son, Be strong and courageous, and do it; fear not nor be dismayed: for Jehovah Elohim, my God, will be with thee; he will not leave thee, neither forsake thee, until all the work for the service of the house of Jehovah is finished.