Shiva Purana
तत्तत्तीर्थे च तन्मासि स्नानमिंद्र पदप्रदम् । गंगां वा सह्यजां वापि समाश्रित्य वसेद्बुधः ३१ ।
The ceremonial ablutions taken in the different sacred waters in the respective months accord the region of Indra. An intelligent man shall resort to Gaṅgā or the Kāverī river.
english translation
tattattIrthe ca tanmAsi snAnamiMdra padapradam । gaMgAM vA sahyajAM vApi samAzritya vasedbudhaH 31 ।
hk transliteration by Sanscript