Mudgalapurana 4.17.50

4.17.50

anyacchṛṇu caritraṃ tadvratajaṃ puṇyavardhanam |
āṣāḍhe varadāyāśca bhuktimuktiphalapradam ||

Hear another deed born of that observance, which increases merit / and yields the fruit of worldly enjoyment and liberation, belonging to the boon-granting [fourth lunar day] in Āṣāḍha.