'Be Strong' in the Bible

And fourth kingdom will be strong as iron, [and] {just as} iron crushes and smashes {everything}, and as iron shatters all of these [other metals], [so] it will crush and it will shatter [these nations].

And [as] the toes of the feet [were] partly iron and partly clay, [so] part of the kingdom will be strong {and partly brittle}.

And he said, "You must not fear, beloved man. {Peace be to you}; be strong and be courageous!" And {when he spoke} with me, I was strengthened and I said, "Let my lord speak, for you have strengthened me."