Mahabharata 12.159.51

सुरापो नियताहारो ब्रह्मचारी क्षमाचरःऊर्ध्वं त्रिभ्योऽथ वर्षेभ्यो यजेताग्निष्टुता परम्ऋषभैकसहस्रं गा दत्त्वा शुभमवाप्नुयात्

surāpo niyatāhāro brahmacārī kṣamācaraḥūrdhvaṃ tribhyo'tha varṣebhyo yajetāgniṣṭutā paramṛṣabhaikasahasraṃ gā dattvā śubhamavāpnuyāt

Our plain-language meaning of this verse is waiting for scholar review.