Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
संसिद्धिरेवं सोमस्य पक्षयोः शुक्लकृष्णयोः / इत्येवं पितृमान्सोमः स्मृत इड्वत्सरात्मकः
saṃsiddhirevaṃ somasya pakṣayoḥ śuklakṛṣṇayoḥ / ityevaṃ pitṛmānsomaḥ smṛta iḍvatsarātmakaḥ
Thus is Soma fulfilled in the bright and dark fortnights; Soma, joined with the Pitṛs, is remembered as having the nature of Idvatsara.