Shiva Purana
गंगायास्तवनं तेन बहुधा च तदा कृतम् ॥ मानसं स्नानकर्मादि कृत्वा शंकरपूजनम् ॥ ४२ ॥
He eulogised Gaṅgā in various ways. He performed the rites of ablutions and the worship of Śiva.
english translation
gaMgAyAstavanaM tena bahudhA ca tadA kRtam ॥ mAnasaM snAnakarmAdi kRtvA zaMkarapUjanam ॥ 42 ॥
hk transliteration by Sanscript