Brihadaranyaka Upanishad 2.5.6

2.5.6

imā diśaḥ sarveṣāṃ bhūtānāṃ madhvāsāṃ diśām̐ sarvāṇi bhūtāni madhu yaścāyamāsu dikṣu tejomayo'mṛtamayaḥ puruṣoyaścāyamadhyātmam̐ śrotraḥ prātiśrutkastejomayo'bhṛtamayaḥ puruṣo'yameva sa yo'yamātmedamamṛtamidaṃ brahmedam̐ sarvam

This space (disah, the quarters) is the honey of all beings, and all beings are the honey of this space. Likewise this bright, immortal person in this space, and that bright, immortal person existing as the ear in the body (both are madhu). He indeed is the same as that Self, that Immortal, that Brahman, that All.