Kauṣītaki Upaniṣad 2.9.6

2.9.6

rājā ta ekaṃ mukhaṃ tena mukhena viśo 'tsi /

9 (6). Now, on the night of the full moon one should, in the same manner, worship the moon as it appears in the east, saying:— ‘Thou art King Soma. Thou art the Far-shining, the Five-mouthed, Prajāpati (Lord of Creation). The Brahman (brāhmaṇa) is one mouth of thee. With that mouth thou eatest the kings. With that mouth make me an eater of food. The king (rājan) is one mouth of thee. With that mouth

thou eatest the people (viś). With that mouth make me an eater of food.