'Be Strong' in the Bible

Ephraim shall no more be strong, and Damascus shall no more be a kingdom. And as for the glory of the remnant of the Syrians, it shall be as the glory of the children of Israel, sayeth the LORD of Hosts.

Be still, ye Islands, and hearken unto me. Be strong ye people; Come hither, and show your cause: we will go to the law together.

Every man exhorted his neighbour, and brother, and bad him be strong.

Wake up, wake up, and be strong: O thou arm of the LORD: wake up, like as in times past, ever, and since the world began.