Manava Dharmashastra 5.276

Manvarthamuktāvalī 5.276

kṛṣṇapakṣe daśamīmārabhya caturdaśīṃ tyaktvā śrāddhe yathā tithayaḥ śreṣṭhā mahāphalā na tathaitadanyāḥ pratipadādayaḥ|