'Be Strong' in the Bible

So says Jehovah of Hosts: Let your hands be strong, you who hear in these days these Words by the mouth of the prophets, that in the day the house of Jehovah of Hosts is founded, the temple is to be built.

And it will be, as you were a curse among the nations, O house of Judah and house of Israel, so I will save you, and you shall be a blessing. Do not fear, but let your hands be strong.