'Be Strong' in the Bible

In the first year of Cyrus the king, the same Cyrus the king made a decree concerning the house of God at Jerusalem, Let the house be built, the place where they offered sacrifices, and let its foundations be strongly laid; its height threescore cubits, and its breadth threescore cubits;

Now therefore give not your daughters unto their sons, neither take their daughters unto your sons, nor seek their peace or their wealth forever: that you may be strong, and eat the good of the land, and leave it for an inheritance to your children forever.