Brihadaranyaka Upanishad 2.5.1

2.5.1

iyaṃ pṛthivī sarveṣāṃ bhūtānāṃ madhvasyai pṛthivyai sarvāṇi bhūtāni madhu yaścāyamasyāṃ pṛthivyāṃ tejomayo'mṛtamayaḥ pṛruṣo yaścāyamadhyātmam̐ śārīrastejomayo'mṛtamayaḥ puruṣo'yameva sa yo'yamātmedamamṛtamidaṃ brahmedam̐ sarvam

This earth is the honey (madhu, the effect) of all beings, and all beings are the honey (madhu, the effect) of this earth. Likewise this bright, immortal person in this earth, and that bright immortal person incorporated in the body (both are madhu). He indeed is the same as that Self, that Immortal, that Brahman, that All.