Mahabharata 12.331.23
ततः स ददृशे देवौ पुराणावृषिसत्तमौतपश्चरन्तौ सुमहदात्मनिष्ठौ महाव्रतौ
tataḥ sa dadṛśe devau purāṇāvṛṣisattamautapaścarantau sumahadātmaniṣṭhau mahāvratau
Our plain-language meaning of this verse is waiting for scholar review.
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