Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
इत्येते पितरो देवा देवाश्च पितरश्च वै / ऋत्वर्तवार्द्धमासास्तु अन्योन्यं पितरः स्मृताः
ityete pitaro devā devāśca pitaraśca vai / ṛtvartavārddhamāsāstu anyonyaṃ pitaraḥ smṛtāḥ
Thus the Pitṛs are gods, and the gods too are truly Pitṛs. The seasons (ṛtu), the seasonal cycles (artava), and the half-months (arddhamāsa) are remembered as Pitṛs to one another.