Shiva Purana
तस्यां च ब्रह्मणः पुर्य्यां पातयित्वेन्दुमण्डलम् ॥ विष्णुपादविनिष्क्रांता गंगा पतति वै नदी ॥ २९ ॥
Issuing from Viṣṇu’s feet, the river Gaṅgā falls in that city of Brahmā flowing through the sphere of the moon.
english translation
tasyAM ca brahmaNaH puryyAM pAtayitvendumaNDalam ॥ viSNupAdaviniSkrAMtA gaMgA patati vai nadI ॥ 29 ॥
hk transliteration by Sanscript