Chāndogya Upaniṣad 6.8.4

6.8.4

tasya kva mūlaṃ syād anyatrānnāt \
evam eva khalu somyānnena śuṅgenāpo mūlam anviccha \
adbhiḥ somya śuṅgena tejo mūlam anviccha \
tejasā somya śuṅgena sanmūlam anviccha \
sanmūlāḥ somyemāḥ sarvāḥ prajāḥ sadāyatanāḥ satpratiṣṭhāḥ \\608.4\

4. What else could its root be than food? Even so, my dear, with food for a sprout, look for water as the root. With water, my dear, as a sprout, look for heat as the root. With heat, my dear, as a sprout, look for Being as the root. All creatures here, my dear, have Being as their root, have Being as their home, have Being as their support.