'Be Strong' in the Bible

Be strong, be courageous on behalf of our people and for the cities of our God, and may the LORD do what he thinks is best."

Then Absalom instructed his young men, "Please keep watching Amnon until he's drunk. Then I'll tell you, "Attack Amnon!' As soon as I do, kill him and don't be afraid! You have your orders, so be strong and brave!"