Taittirīyopaniṣat 03.09

अन्नं न परिचक्षीत। तद् व्रतम्। आपो वा अन्नम्। ज्योतिरन्नादम्। अप्सु ज्योतिः प्रतिष्ठितम्। ज्योतिष्यापः प्रतिष्ठिताः। तदेतदन्नमन्ने प्रतिष्ठितम्। स य एतदन्नमन्ने प्रतिष्ठितं वेद प्रतितिष्ठति। अन्नवानन्नादो भवति। महान् भवति प्रजया पशुभिर्ब्रह्मवर्चसेन। महान् कीर्त्या ॥९॥

annaṃ na paricakṣīta। tad vratam। āpo vā annam। jyotirannādam। apsu jyotiḥ pratiṣṭhitam। jyotiṣyāpaḥ pratiṣṭhitāḥ। tadetadannamannne pratiṣṭhitam। sa ya etadannamannne pratiṣṭhitaṃ veda pratitiṣṭhati। annavānannādo bhavati। mahān bhavati prajayā paśubhirbrahmavarcasena। mahān kīrtyā ॥9॥

[अन्नम् (annam) - food; न (na) - not; परिचक्षीत (paricakṣīta) - should reject; तत् (tat) - that; व्रतम् (vratam) - vow; आपः (āpaḥ) - waters; वा (vā) - indeed; अन्नम् (annam) - food; ज्योतिः (jyotiḥ) - light; अन्नादम् (annādam) - eater of food; अप्सु (apsu) - in waters; ज्योतिः (jyotiḥ) - light; प्रतिष्ठितम् (pratiṣṭhitam) - established; ज्योतिषि (jyotiṣi) - in light; आपः (āpaḥ) - waters; प्रतिष्ठिताः (pratiṣṭhitāḥ) - are established; तत् (tat) - that; एतत् (etat) - this; अन्नम् (annam) - food; अन्ने (anne) - in food; प्रतिष्ठितम् (pratiṣṭhitam) - established; सः (saḥ) - he; यः (yaḥ) - who; एतत् (etat) - this; अन्नम् (annam) - food; अन्ने (anne) - in food; प्रतिष्ठितम् (pratiṣṭhitam) - established; वेद (veda) - knows; प्रतितिष्ठति (pratitiṣṭhati) - becomes established; अन्नवान् (annavān) - possessed of food; अन्नादः (annādaḥ) - eater of food; भवति (bhavati) - becomes; महान् (mahān) - great; भवति (bhavati) - becomes; प्रजया (prajayā) - by progeny; पशुभिः (paśubhiḥ) - by cattle; ब्रह्मवर्चसेन (brahmavarcasena) - by spiritual lustre; महान् (mahān) - great; कीर्त्या (kīrtyā) - by fame;]

One should never reject food; this is the vow. Water is indeed food, and light is consumed by the food. Light is established in the waters, and waters are established in the light. Thus, this food is established in food. Whoever knows this food established in food becomes established himself. He becomes possessed of food and an eater of food. He becomes great through progeny, cattle, spiritual brilliance, and fame.