Brihadaranyaka Upanishad 2.5.14

2.5.14

ayamāsmā sarveṣāṃ bhūtānāṃ madhvasyātmanaḥ sarvāṇi bhūtāni madhu yaścāyamasminnātmani tejomayo'mṛtamayaḥ puruṣo yaścāyamātmā tejomayo'mṛtamayaḥ puruṣo'yameva sa yo'yamātmedamamṛtamidaṃ brahmedam̐ sarvam

This (cosmic) body is like honey to all beings, and all beings are like honey to this (cosmic) body. (The same with) the shining, immortal being who is in this (cosmic) body, and the shining, immortal being who is this (individual) self. (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.