'Be Strong' in the Bible

But you be strong and do not let your hands be weak, for your work shall be rewarded.

But if you will go, do it! Be strong for the battle, for God shall make you fall before the enemy, for God has power to help and to throw down.

And he commanded the people who lived in Jerusalem to give the portion of the priests and the Levites so that they might be strong in the Law of Jehovah.

Be strong and courageous. Do not be afraid nor dismayed because of the king of Assyria, or for all the multitude with him. For there are more with us than with him.