Skandapurana 5.239.15

5.239.15

ārtikyaṃ ca tataḥ kuryātsarvapāpavināśanam ..
caturdaśyā namaskuryādviṣṇave yatirūpiṇe .. 15 ..

Then one should perform the waving of lights, which destroys all sins. / On the fourteenth lunar day, one should bow down to Viṣṇu in the form of an ascetic. 15