'Be Strong' in the Bible

In the first year of Cyrus the king, Cyrus the king made a decree: Concerning God's house at Jerusalem, let the house be built, the place where they offer sacrifices, and let its foundations be strongly laid; its height sixty cubits, and its breadth sixty cubits;

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