1. And when they bring you before the synagogues and the rulers and the authorities, do not become anxious about how or what you should speak in your defense, or what you should say (Luke 12:11).

Jesus uses "defense" here with the idea of our defending the faith before institutions and authorities.

2. So make up your minds not to prepare beforehand to defend yourselves (Luke 21:14).

This could be a formal defense before those who were making a legal charge.

3. And some of the crowd concluded it was Alexander, since the Jews had put him forward; and having motioned with his hand, Alexander was intending to make a defense to the assembly (Acts 19:33).

Alexander was attempting to respond to the charges made against him.

4. And when the governor had nodded for him to speak, Paul responded: Knowing that for many years you have been a judge to this nation, I cheerfully make my defense (Acts 24:10).

Again, we have Paul's defense to charges that were brought against him. In this case it is before the governor.

5. while Paul said in his own defense, "I have committed no offense either against the Law of the Jews or against the temple or against Caesar" (Acts 25:8).

Paul is responding to the specific charges that he has committed offenses either against the Jews, their religion, or Rome.

6. And Agrippa said to Paul, "You are permitted to speak for yourself." Then Paul stretched out his hand and proceeded to make his defense (Acts 26:1).

He begins his legal defense before King Agrippa.

7. In regard to all the things of which I am accused by the Jews, I consider myself fortunate, King Agrippa, that I am about to make my defense before you today (Acts 26:2).

Again, we have another use of the term in a sense of a legal defense. Paul makes his defense before Agrippa, verse 22 is the key to understand of what his defense consisted.

And so, having obtained help from God, I stand to this day testifying both to small and great, stating nothing but what the Prophets and Moses said was going to take place (Acts 26:22).

Paul argues that he is teaching nothing different than what is found in Moses (the Law) and the Old Testament prophets.

8. And while Paul was saying this in his defense, Festus said in a loud voice, "Paul, you are out of your mind! Your great learning is driving you mad (Acts 26:24).

Here Paul is interrupted by Festus as he is making his defense.

9. in that they show the work of the Law written in their hearts, their conscience bearing witness, and their thoughts alternately accusing or else defending them (Romans 2:15).

The thoughts of humans can either bring an accusation or a defense.

10. All this time you have been thinking that we are defending ourselves to you. Actually, it is in the sight of God that we have been speaking in Christ; and all for your upbuilding, beloved (2 Corinthians 12:19).