अग्निनिचयः (Agninichaya) / The Accumulation of Sacred Fire & the Classification of Pitṛs by Time-Order
एते प्रजानां पतयश्चत्वार उपपक्षजाः / पितरः सर्वलोकानां लोकात्मानः प्रकीर्त्तिताः
ete prajānāṃ patayaścatvāra upapakṣajāḥ / pitaraḥ sarvalokānāṃ lokātmānaḥ prakīrttitāḥ
These four Prajāpatis, born of the secondary line, are lords of creatures; they are proclaimed as the Pitṛs of all worlds, as the very souls of the worlds.