Valmiki Ramayana Sundara Kanda Sarga 52 Shloka 14

अयम् this, शत्रुः enemy, प्रवृद्धः has grown, असंशयम् no doubt, अनेन by him, अप्रमेयम् incomparable, अप्रियम् unpleasant act, कृतं हि indeed has been done, सन्तः wise, दूतवध्याम् killing of an emissary, न प्रवदन्ति do not approve, दूतस्य emissary's, बहवः many, दण्डाः punishments, दृष्टाः हि indeed have recommended.

This enemy has done a lot of harm, no doubt. Indeed he has done terrible and unpleasant deeds. (Yet) the wise have recommended many alternate punishments, while prohibiting their killing.