Śatapatha Brāhmaṇa ("of a hundred paths") 10.2.2.5

10.2.2.5

sa vai saptapuruṣo bhavati saptapuruṣo hyayam puruṣo yaccatvāra ātmā trayaḥ pakṣapucāni catvāro hi tasya puruṣasyātmā trayaḥ pakṣapucāni

He indeed consists of seven persons, for that Person consisted of seven persons;--to wit, the body of four, and the wings and tail of three, for of four the body of that Person consisted, and of three his wings and tail.