Saṃkhyāvarta (संख्यावर्त्त): Commencement of Yajña at the Dawn of Tretāyuga
यज्ञप्रवर्त्तनं ह्येवमासीत्स्वायंभुवे ऽन्तरे / ततः प्रभृति यज्ञो ऽयं युगैः सह विवर्त्तितः
yajñapravarttanaṃ hyevamāsītsvāyaṃbhuve 'ntare / tataḥ prabhṛti yajño 'yaṃ yugaiḥ saha vivarttitaḥ
Thus was the yajña set in motion in the Svāyambhuva Manvantara. From that time onward, this yajña has continued, unfolding along with the yugas.