Matsyapurana 141.17

141.17

gṛhamedhinaśca yajvāno hy agniṣvāttārtavāḥ smṛtāḥ
aṣṭakāpatayaḥ kāvyāḥ pañcābdāṃstu nibodhata //

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

Now hear about the 5 years Agni is the Samvatsara, the Sun is the Parivatsara the Moon is Iḍvatsara the Wind is the Anuvatsara, the Rudra is the Vatsara These are the cycle of 5 years The Moon presiding over them, in due time, sheds ambrosia—17 18