Mudgalapurana 5.21.51

5.21.51

pātālavivare kṣetraṃ bhaviṣyati susiddhidam |
tatra māṃ pūjayiṣyanti tebhyaḥ sarvaṃ dadāmyaham ||

In a chasm of Pātāla there will be a sacred site that bestows supreme perfection; / there, people will worship me, and to them I will give everything.”