Muṇḍaka Upaniṣad 1.1.7

1.1.7

yathorṇanābhiḥ sṛjate gṛhṇate ca yathā pṛthivyām oṣadhayaḥ sambhavanti.
yathā sataḥ puruṣāt keśalomāni tathākṣarāt sambhavatīha viśvam.

'As the spider sends forth and draws in its thread, as plants grow on the earth, as from every man hairs spring forth on the head and the body, thus does everything arise here from the Indestructible.'