Skandapurana 5.199.14

5.199.14

tvayā sthānamidaṃ puṇyaṃ kṛtaṃ pūrvaṃ mahāmate ..
sarveṣāṃ ca gurustvaṃ hi tasmācchuddhiṃ vadasva naḥ .. 14 ..

Formerly this sacred place was established by you, O high-minded one, / and you indeed are the guru of all; therefore, tell us the purification.”