अग्निनिचयः (Agninichaya) / The Accumulation of Sacred Fire & the Classification of Pitṛs by Time-Order
ऋतुपुत्राः स्मृताः पञ्च प्रजाः स्वार्तवलक्षणाः / यस्माच्चैवार्त्तवेभ्यस्तु जायन्ते स्थाणु जङ्गमाः
ṛtuputrāḥ smṛtāḥ pañca prajāḥ svārtavalakṣaṇāḥ / yasmāccaivārttavebhyastu jāyante sthāṇu jaṅgamāḥ
From the sons of the seasons are remembered five kinds of creatures, bearing the marks of the seasonal power (ārtava). For from those ārtavas are born all beings, both the unmoving and the moving.