Kena (Talavakāra) Upaniṣad 3.4

3.4

tad abhyadravat
tam abhyavadat
ko 'sīty
agnir vā aham asmīty abravīj
jātavedā vā aham asmīti

16 (3). They said to Agni (Fire): ‘Jātavedas, find out this—what this wonderful being is.’ ‘So be it.’ 17 (4). He ran unto It. Unto him It spoke: ‘Who are you?’ ‘Verily, I am Agni,’ said he. ‘Verily, I am Jātavedas.’ 18 (5). ‘In such as you what power is there?’ ‘Indeed, I might burn everything here, whatever there is here in the earth!’