अग्निनिचयः (Agninichaya) / The Accumulation of Sacred Fire & the Classification of Pitṛs by Time-Order
मध्वादयः षडृतवः पितॄंस्तान्परिचक्षते / ऋतवः पितरो देवा इत्येषा वैदिकी श्रुतिः
madhvādayaḥ ṣaḍṛtavaḥ pitṝṃstānparicakṣate / ṛtavaḥ pitaro devā ityeṣā vaidikī śrutiḥ
The six seasons, beginning with Madhū, are spoken of as those Pitṛs. “The seasons are the Pitṛs, and the Pitṛs are the devas”—such is the Vedic Śruti.