Mahabharata 3.209.18

ब्रह्मचारी यतात्मा च सततं विपुलव्रतःब्राह्मणाः पूजयन्त्येनं पाकयज्ञेषु पावकम्

brahmacārī yatātmā ca satataṃ vipulavrataḥbrāhmaṇāḥ pūjayantyenaṃ pākayajñeṣu pāvakam

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