Skandapurana 1.4.11.161

1.4.11.161

marīcipāḥ puṣpajaṃ ca jñānagamyeti nāma ca..
śakṛtāḥ śakṛtaṃ liṃgaṃ jñānajñeyeti nāma ca.. 13.161 ..

the drinkers of sunbeams, a flower liṅga, and the name “Attainable by Knowledge”;
those living on cow dung, a cow-dung liṅga, and the name “Knowable by Knowledge”;