Skandapurana 1.3.15.118

1.3.15.118

gokṣīrasnānaṃ deveśa gokṣīreṇa mayā kṛtam..
snapanaṃ devadeveśa gṛhāṇa parameśvara.. 17.118 ..

'O Lord of gods, a ritual ablution with cow's milk has been performed by me with cow's milk. / Accept the ceremonial bath, O Lord of the gods of gods, O Supreme Lord!