The tribune directed that [Paul] was to be brought into the barracks, and ordered him to be examined by flogging, to find out the reason for this outcry against him. But when they had tied him up with thongs, Paul said to the centurion who was standing by, "Is it legal for you to flog a Roman citizen who is uncondemned?" When the centurion heard that, he went to the tribune and said to him, "What are you about to do? This man is a Roman citizen." The tribune came and asked Paul, "Tell me, are you a Roman citizen?" And he said, "Yes." The tribune answered, "It cost me a large sum of money to get my citizenship." Paul said, "But I was born a citizen." Immediately those who were about to examine him drew back from him; and the tribune also was afraid, for he realized that Paul was a Roman citizen and that he had bound him. (Acts 22:24-29, NRSV)
The chief captain commanded [Paul] to be brought into the castle, and bade that he should be examined by scourging; that he might know wherefore they cried so against him. And as they bound him with thongs, Paul said unto the centurion that stood by, Is it lawful for you to scourge a man that is a Roman, and uncondemned? When the centurion heard that, he went and told the chief captain, saying, Take heed what thou doest: for this man is a Roman. Then the chief captain came, and said unto him, Tell me, art thou a Roman? He said, Yea. And the chief captain answered, With a great sum obtained I this freedom. And Paul said, But I was free born. Then straightway they departed from him which should have examined him: and the chief captain also was afraid, after he knew that he was a Roman, and because he had bound him. (Acts 22:24-29, KJV)
Again, Paul uses his Roman citizenship card to right a wrong. The tribune knows that this is a pretty big no-no and that Paul's natural-born citizenship outranks his purchased papers. Paul also seems to have learned his lesson from last time—tell them you're a Roman citizen before they start to flog you.