Ramayana
देवानां भयभीतानां हरिणा राक्षसर्षभौ । प्रतिज्ञातो वधो ऽस्माकं चिन्त्यतां यदिह क्षमम् ॥ 7-6-33 ॥
By Hari the slaying of those two bulls among Rakshasas was promised to us terrified gods; let it now be considered what is fitting here.
english translation