Valmiki Ramayana Ayodhya Kanda Sarga 75 Shloka 26

आर्यः esteemed one, यस्य whose, अनुमते with sanction, गतः exiled, तपस्विभ्यः for ascetics, सत्रे at sacrifice, यज्ञदक्षिणाम् the offerings at a sacrifice, संश्रुत्य having promised, ताम् that one, विप्रलवताम् those who deny them later, पापम् acquire sin.

May the one who counselled the exile of my esteemed brother acquire the sin in the same way as a person acquires for having promised the ascetics the required offering at a sacrifice and later denies them