Different Upanishads 118.2

Different Upaniṣads 118.2

āpaḥ pītāstredhā vidhīyante| tāsāṃ yaḥ sthaviṣṭho dhātustanmūtraṃ
bhavati| yo madhyamastallohitam| yo'ṇiṣṭhaḥ sa prāṇaḥ