Acts 22:25-29

But when they stretched him out with straps, Paul said to the centurion who was standing by, “Is it lawful for you to flog a man who is a Roman and uncondemned?”

When the centurion heard this, he went to the commander and told him, saying, “What are you about to do? For this man is a Roman.”

The commander came and said to Paul, “Tell me, are you a Roman?” And he said, “Yes.”

The commander answered, “I acquired this citizenship for a large sum of money.” And Paul said, “But I was actually born a citizen.”

Therefore, those who were about to interrogate him immediately backed away from him; and the commander also was afraid when he found out that he was a Roman, and because he had put him in chains.