Shiva Purana
तस्यां स्नानेन वासेन पदं वैष्णवमाप्नुयात् । तमसा द्वादशमुखा रेवा दशमुखा नदी १३ ।
By a dip therein and residing on its banks the devotee shall attain the region of Viṣṇu. The river Tamasā is of twelve mouths and Revā has ten mouths.
english translation
tasyAM snAnena vAsena padaM vaiSNavamApnuyAt । tamasA dvAdazamukhA revA dazamukhA nadI 13 ।
hk transliteration by Sanscript