Mahabharata 3.91.20

शरीरनियमं ह्याहुर्ब्राह्मणा मानुषं व्रतम्मनोविशुद्धां बुद्धिं च दैवमाहुर्व्रतं द्विजाः

śarīraniyamaṃ hyāhurbrāhmaṇā mānuṣaṃ vratammanoviśuddhāṃ buddhiṃ ca daivamāhurvrataṃ dvijāḥ

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