Manava Dharmashastra 1.66

Manvarthamuktāvalī 1.66

mānuṣāṇāṃ māsaḥ pitṝṇāmahorātre bhavataḥ| tatra pakṣadvayena vibhāgaḥ| karmānuṣṭhānāya pūrvapakṣo'haḥ| svāpārthaṃ śuklapakṣo rātriḥ |