'Be Strong' in the Bible

Watch ye, stand fast in the faith, quit you like men, and be strong.

Finally, my brethren, be strong in the Lord, and in the power of his might.

Thou, therefore, my son be strong in the grace that is in Christ Jesus.

I write unto you fathers, how that ye have known him that was from the beginning. I write unto you young men, how that ye be strong; and the word of God dwelleth in you, that ye have overcome the wicked.