The dictionary:  “acorn the fruit of the oak tree, consisting of a smooth thick-walled nut in a woody cuplike base.”

Ephesians 6:13

“Therefore put on the full armour of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand.”

Ephesians 6:14

Stand firm then,

—with the belt of truth buckled around your waist,

—with the breastpiece of righteousness in place, and

—with your feet fitted with the readyness that comes from the gospel of peace.”

First Corinthians 15:58

“Therefore my dear brothers, stand firm. Let nothing move you.”

First Corinthians 16:13

—“Be on your guard;

—stand firm in the faith;

—be men of courage;

—be strong.

—Do everything in  love.”

Galatians 5:1

“It is for freedom that Christ has set you free.  Stand firm, then, and do not let yourselves be burdened again by a yoke of slavery.”

There are more verses, but I will close with this very important one:  Isaiah 7:9 “‘If you do not stand firm in your faith, you will not stand at all.'”