TAITTIRĪYA UPANISHAD · 3.8

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

annaṃ na paricakṣīta । tadvratam । āpo vā annam ।
jyotirannādam । apsu jyotiḥ pratiṣṭhitam ।
jyotiṣyāpaḥ pratiṣṭhitāḥ । tadetadannamanne pratiṣṭhitam ।
sa ya etadannamanne pratiṣṭhitaṃ veda pratitiṣṭhati ।
annavānannādo bhavati । mahānbhavati prajayā
paśubhirbrahmavarcasena । mahān kīrtyā ।

Thou shalt not reject food; for that too is the vow of thy labour. Verily the waters also are food, and the bright fire is the eater. The fire is established upon the waters and the waters are established upon the fires. Here too is food established upon food. He who knoweth this food that is established upon food, getteth his firm base, he becometh the master of food and its eater, great in progeny, great in cattle, great in the radiance of holiness, great in glory.

Sri Aurobindo · CWSA 18, p. 228