Matsyapurana 141.29

141.29

ityeṣa pitṛmānsomaḥ smṛtastadvasudhātmakaḥ
kāntaḥ pañcadaśaiḥ sārdhaṃ sudhābhṛtaparisravaiḥ //

The phases of the Moon that wax in course of the bright fortnight fed by Suṣumṇâ wane during the dark fortnight In this way the Moon continues to wax and wane, consequently, the full moon is called the receptacle of nectar He is luminous with the fifteen nectar giving phases. He is, therefore, called Pitṛimân—26 28