'Be Strong' in the Bible

Now therefore let your hands be strong, and be valiant; for Saul your lord is dead, and also the house of Judah have anointed me king over them."

Be courageous, and let us be strong for our people, and for the cities of our God; and the LORD do that which seems good to him."

Ahithophel said to Absalom, "Go in to your father's concubines, that he has left to keep the house. Then all Israel will hear that you are abhorred by your father. Then the hands of all who are with you will be strong."