Brihadaranyaka Upanishad 1.28
स वा एष प्राणो ह वै ज्येष्ठश्च श्रेष्ठश्च । तदेतत्प्राणो ह वै ज्येष्ठश्च श्रेष्ठश्चेत्येतदु होवाच ।प्राणो ह वा ज्येष्ठश्च श्रेष्ठश्च — प्राणो ह्यश्नाति — प्राणो ह वाव ज्येष्ठ: श्रेष्ठश्च भवति ॥
sa va esha prano ha vai jyeshthash cha shreshthash cha | tad etat prano ha vai jyeshthash cha shreshthash chety etad u hovacha | prano ha va jyeshthash cha shreshthash cha — prano hy ashnati — prano ha vav jyeshthah shreshthash cha bhavati ||
This Prana is verily the eldest and the best. This was declared: 'Prana is the eldest and the best.' Prana is indeed the eldest and the best, for Prana eats. He who knows this becomes the eldest and the best.
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