Valmiki Ramayana Ayodhya Kanda Sarga 75 Shloka 55

आर्यः esteemed one, यस्य whose, अनुमते with sanction, गतः exiled, सः that person, एकः only alone, पानीयदूषके in the case of a man who pollutes drinking water, तथैव similarly, विषदायके administers poison to others, यत् पापम् such sin, लभताम् will obtain.

May the sin of polluting drinking water and administering poison to others be put together and be incurred by the man who counselled the exile of my esteemed brother