'Be Strong' in the Bible

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

now therefore give not your daughters unto their sons, neither take their daughters unto your sons, nor seek their peace or their prosperity for ever; that ye may be strong, and eat the good of the land, and leave it for an inheritance to your children for ever.