'Be Strong' in the Bible

Ye, therefore, be strong, and let not your hands be slack, - for there is a reward for your work!

And lo! Amariah the chief priest, is over you as to every matter of Yahweh, and Zebadiah son of Ishmael the chief ruler for the house of Judah, as to every matter of the king, and, as officers, the Levites are before you, - Be strong and act, and Yahweh be with the good!

But, if thou art going, do, be strong for the battle, - God will cause thee to fall before the enemy, for there is strength in God, to help or to cause to fall.

Be strong and bold, do not fear neither be dismayed, because of the king of Assyria, nor because of all the multitude that is with him, - for, with us, is One greater than with him: