Mahabharata 13.131.43

गोब्राह्मणहितार्थाय रणे चाभिमुखो हतःत्रेताग्निमन्त्रपूतं वा समाविश्य द्विजो भवेत्

gobrāhmaṇahitārthāya raṇe cābhimukho hataḥtretāgnimantrapūtaṃ vā samāviśya dvijo bhavet

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