Skandapurana 6.3.179.10

6.3.179.10

māse cāśvayuje rājan kṛṣṇapakṣe caturdaśīm .
snātvā tatra vidhānena dīpakānāṃ śataṃ dadet .. 179.10 ..

And in the month of Āśvayuja, O king, on the fourteenth day of the dark fortnight, / having bathed there according to the rule, one should offer a hundred lamps.