'Be Strong' in the Bible

Thus said Jehovah of Hosts: Let your hands be strong, Ye who are hearing in these days these words from the mouth of the prophets, That in the day the house of Jehovah of Hosts Hath been founded, the temple is to be built.

And it hath come to pass, As ye have been a reviling among nations, O house of Judah, and house of Israel, So I save you, and ye have been a blessing, Do not fear, let your hands be strong.