Kaṭha Upaniṣad 9

9

pītodakā jagdhatṛṇā dugdhadohā nirindriyāḥ /
anandā nāma te lokāstānsa gacchati tā dadat ///1,1.3 //

3. (These cows) have drunk water for the last time, eaten grass for the last time, have yielded all their milk and are devoid of vigour. Joyless verily are those worlds; them he attains who gives these.