मनुस्मृति - राजा

अदण्ड्यान् दण्डयन् राजा दंड्यांश्चैवाप्यदण्डयन् |
अयशो महदाप्नोति नरकं चैव गच्छति ||

- मनुस्मृति

If a king punishes the innocent and fails to punish the guilty, he will become very infamous. In addition to that, he will go to hell.

- Manu Smriti