Mahabharata 6.13.27

विप्राणां ब्रह्मचर्येण सत्येन च दमेन चआरोग्यायुःप्रमाणाभ्यां द्विगुणं द्विगुणं ततः

viprāṇāṃ brahmacaryeṇa satyena ca damena caārogyāyuḥpramāṇābhyāṃ dviguṇaṃ dviguṇaṃ tataḥ

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