'Ashamed' in the Bible

Therefore don't be ashamed of the testimony of our Lord, nor of me his prisoner; but endure hardship for the Good News according to the power of God,

For this cause I also suffer these things. Yet I am not ashamed, for I know him whom I have believed, and I am persuaded that he is able to guard that which I have committed to him against that day.

May the Lord grant mercy to the house of Onesiphorus, for he often refreshed me, and was not ashamed of my chain,

Give diligence to present yourself approved by God, a workman who doesn't need to be ashamed, properly handling the Word of Truth.