Jaiminīya Upaniṣad Brāhmaṇa 2.3.1

2.3.1

eṣa evedam agra āsīd ya eṣa tapati
sa eṣa sarveṣām bhūtānāṃ tejo hara indriyaṃ vīryam ādāyordhva udakrāmat /

He indeed who burns here was this [universe] in the beginning;
he, having taken the fiery brilliance, glow, faculty, and vigor of all beings, stepped upward.