अग्निनिचयः (Agninichaya) / The Accumulation of Sacred Fire & the Classification of Pitṛs by Time-Order
स इडावत्सरः सोमः पुराणे निश्चयं गतः / यश्चायं पवते लोकांस्तनुभिः सप्तसप्तभिः
sa iḍāvatsaraḥ somaḥ purāṇe niścayaṃ gataḥ / yaścāyaṃ pavate lokāṃstanubhiḥ saptasaptabhiḥ
That Soma is Idavatsara—this is firmly established in the Purana. And he purifies the worlds with his seven-times-seven embodied forms.