Kaṭha Upaniṣad 124

124

yasya brahma ca kṣatraṃ ca ubhe bhavata odanaḥ /
mṛtyur yasyopasecanaṃ ka itthā veda yatra saḥ ///1,2.25 //

25. Of whom, the Brahma and the Kshatriya classes are the food, and Death but pickles (to supplement it); how can one thus know where that atman is.