Acts 22:25-26 NIV

25 As they stretched him out to flog him, Paul said to the centurion standing there, "Is it legal for you to flog a Roman citizen who hasn't even been found guilty?"1

References for Acts 22:25

26 When the centurion heard this, he went to the commander and reported it. "What are you going to do?" he asked. "This man is a Roman citizen."