Matsyapurana 141.15

141.15

pitara ṛtavo 'rdhamāsā vijñeyā ṛtusūnavaḥ
pitāmahāstu ṛtavo hy amāvāsyābdasūnavaḥ
prapitāmahāḥ smṛtā devāḥ pañcābdā brahmaṇaḥ sutāḥ //

Pitaras, Ârtavas and Ardhamâsas (fortnights) are the offsprings of the Ṛitus The grandfathers, Amâvasyâs and Seasons are all of the nature of Ṛitu (seasons) The great-grandfathers and the five years,

the sons of Brahmâ are the Devas Saumya, Vahirṣada and Agnisvâtâ pitṛis have been thus defined Those that are Ârtavas lead householder's life and perform sacrifices and accept the sacrificial offerings and are known as Vahirṣada Agnisvâtâ pitṛis also lead householder's life and perform sacrifices They are also known as Ârtavas The Kâvyâ pitṛis are known as the husband of Aṣṭakâs—14 16