Quotation
Do not speak evil about your ruler
When Paul is challenged for insulting the high priest, he says that he was unaware of the man's office and quotes the command not to speak evil about the ruler of the people.
Acts 23:4–5
But those standing nearby said, “How dare you insult the high priest of God!” “Brothers,” Paul replied, “I was not aware that he was the high priest, for it is written: ‘Do not speak evil about the ruler of your people.’”
Exodus 22:28 commands Israel not to blaspheme God or curse the people's ruler; Acts 23:4-5 records the challenge to Paul and introduces the ruler command with "it is written."