Taittirīyopaniṣat 03.10

annaṃ bahu kurvīta। tad vratam। pṛthivī vā annam। ākāśo'nnādaḥ। pṛthivyām ākāśaḥ pratiṣṭhitaḥ। ākāśe pṛthivī pratiṣṭhitā। tad etad annam anne pratiṣṭhitam। sa ya etad annam anne pratiṣṭhitaṃ veda pratitiṣṭhati। annavān annādo bhavati। mahān bhavati prajayā paśubhir brahmavarcasena। mahān kīrtyā ॥10॥

One should produce much food. That is the vow. The earth indeed is food. Ether is the eater of food. In the earth, ether is established. In ether, the earth is established. Thus, this food is established in food. Whoever knows this food established in food becomes established. He becomes possessed of food and an eater of food. He becomes great through progeny, cattle, spiritual brilliance, and fame.