Anandakanda 1.17.32

1.17.32

vāri pūtaṃ viṣaṃ tvalpaṃ viṇmūtrotsarjanātparam /
ajñātavele rātrau cetpibettoyaṃ punaḥ prage //

Water purified [in this way] has little toxicity after the elimination of feces and urine; / if the time was unknown at night, one should drink water again at dawn.