'Be Strong' in the Bible

Then let your hands be strong, and have no fear: though Saul your lord is dead, the people of Judah have made me their king.

Take heart, and let us be strong for our people and for the towns of our God, and may the Lord do what seems good to him.

Now Absalom had given orders to his servants, saying, Now take note when Amnon's heart is glad with wine; and when I say to you, Make an attack on Amnon, then put him to death without fear: have I not given you orders? be strong and without fear.

And Ahithophel said to Absalom, Go in to your father's women who are here looking after his house; then all Israel will have the news that you are hated by your father, and the hands of your supporters will be strong.