Śatapatha Brāhmaṇa ("of a hundred paths") 9.3.1.4

9.3.1.4

te ye ta ime lokāḥ | idaṃ tacira idameva pṛthivyoṣadhayaḥ śmaśrūṇi tadetadviśvaṃ vāgevāgniḥ sa naraḥ sopariṣṭādasya bhavatyupariṣṭāddhyasyā agniḥ

And these worlds are the same as this head,--this (lower part of the head) is the earth, the plants (being) the hair of its beard: this is the All, and Agni is Speech, he is the man. That (speech) is at the top thereof, for Agni is on the top of this (earth).