Shiva Purana
वामचारः समाख्यातो दक्षिणं शृणु सांप्रतम् ॥ अष्टाविंशप्रवाहेण तिथिमानेन जीवति ॥ ६९ ॥
This is in accordance with the left hand practices. Now listen according to the right hand practices. If the flow is for twenty-eight days he lives for that much period.
english translation
vAmacAraH samAkhyAto dakSiNaM zRNu sAMpratam ॥ aSTAviMzapravAheNa tithimAnena jIvati ॥ 69 ॥
hk transliteration by Sanscript