Skandapurana 1.3.29.103

1.3.29.103

..kumāra uvāca..
revāyāṃ toyamadhye ca dṛśyaṃte dṛṣado hi yāḥ..
śivaprasādāttāstu syurliṃgarūpā na cānyathā.. 31.103 ..

Kumāra said:
The stones that are seen in the waters of the Revā,
they indeed, through the grace of Śiva, are forms of the liṅga, and not otherwise. 31.103