Mbh 13.115.2f

Hence, there is no longer any necessity of sanctifying those animals for offering them to the deities and the Pitris. Served with flesh according to the ordinance, the Pitris become gratified. Listen to me, O king of kings, as I tell thee this, O sinless one. There is complete happiness in abstaining from meat, O monarch. He that undergoes severe austerities for a hundred years and he that abstains from meat, are both equal in point of merit. Even this is my opinion, In the lighted fortnight of the month of Karttika in especial, one should abstain from honey and meat. In this, it has been ordained, there is great merit. He who abstains from meat for the four months of the rains acquires the four valued blessings of achievements, longevity, fame and might. He who abstains for the whole month of Karttika from meat of every kind, transcends all kinds of woe and lives in complete happiness. They who abstain from flesh by either months or fortnights at a stretch have the region of Brahma ordained for them in consequence of their abstention from cruelty. Many kings in ancient days, O son of Pritha, who had constituted themselves the souls of all creatures and who were conversant with the truths of all things, viz., Soul and Not-soul, had abstained from flesh either for the whole of the month of Karttika or for the whole of the lighted fortnight in that month. They were Nabhaga and Amvarisha and the high-souled Gaya and Ayu and Anaranya and Dilipa and Raghu and Puru and Kartavirya and Aniruddha and Nahusha and Yayati and Nrigas and Vishwaksena and Sasavindu and Yuvanaswa and Sivi, the son of Usinara, and Muchukunda and Mandhatri, and Harischandra. Do thou always speak the truth. Never speak an untruth. Truth is an eternal duty. It is by truth that Harischandra roves through heaven like a second Chandramas. These other kings also, viz.