अयमग्निः सर्वेषां भूतानां मधु ।अस्याग्नेः सर्वाणि भूतानि मधु ।यश्चायमस्मिन्नग्नौ तेजोमयोऽमृतमयः पुरुषो यश्चायमध्यात्मं वाङ्मयस्तेजोमयोऽमृतमयः पुरुषोऽयमेव स योऽयमात्मा ।इदममृतमिदं ब्रह्मेदं सर्वम् ॥२,५.३ ॥
In plain words
This fire is the honey of all beings, and all beings are the honey of this fire. And the shining, immortal person who is in this fire, and the shining, immortal person here in speech — he is this Self. This is the immortal, this is Brahman, this is all.
The commentators
Bṛhadāraṇyakopaniṣadbhāṣyam· bhāṣya
तथा अग्निः । वाचि अग्नेर्विशेषतोऽवस्थानम् ॥
In plain words
Fire works the same way. In your own body, fire's special home is your power of speech.
Close to the Sanskrit
Likewise [for] fire. In speech is the particular seat of fire.