'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 the foundations of it be strongly laid; the hight of it sixty cubits, and the breadth of it sixty cubits;

Now therefore give not your daughters to their sons, neither take their daughters to your sons, nor seek their peace or their wealth 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.