Valmiki Ramayana Kishkindha Kanda Sarga 55 Shloka 10
Original Shlokaपांशुदण्डेन हि मां बन्धने नोपपादयेत्। शठः क्रूरो नृशंसश्च सुग्रीवो राज्यकारणात्।।4.55.10।।
1 source checked for this shloka
शठः deceitful person, क्रूरः cruel one, नृशंसः treacherous person, सुग्रीवः Sugriva, राज्यकारणात् for the sake of kingdom, माम् me, उपांशुदण्डेन with secret punishment, बन्धनेन imprisonment, उपपादयेत् inflict.
'Sugriva is deceitful, cruel and treacherous. He will inflict secret punishment on me by way of imprisonment for the sake of the kingdom.