Brihadaranyaka Upanishad 2.5.13

2.5.13

idaṃ mānuṣam̐ sarveṣāṃ bhūtānāṃ madhvasyamānuṣasya sarvāṇi bhūtāni madhu yaścāyamasminmānuṣe tajomayo'mṛtamayaḥ puruṣo'yameva sa yo'yamātmedamamṛtamidaṃ brahmedam̐ sarvam

This humanfootnote{This includes the other species.} species is like honey to all beings, and all beings are like honey to this human species. (The same with) the shining, immortal being who is in this human species, and the shining, immortal being identified with the human species in the body. (These four) are but this Self. This (Self-knowledge) is (the means of) immortality; this (underlying unity) is Brahman; this (knowledge of Brahman) is (the means of becoming) all.