Saṃkhyāvarta (संख्यावर्त्त): Commencement of Yajña at the Dawn of Tretāyuga
तद्यचन्ते तदा देवान्कल्पादिषु भवन्ति ये / अध्वर्यवः प्रैषकाले व्यत्थिता वै महर्षयः
tadyacante tadā devānkalpādiṣu bhavanti ye / adhvaryavaḥ praiṣakāle vyatthitā vai maharṣayaḥ
Then they beseech the gods who manifest in the kalpas and other ages; and at the time of the praiṣa-call, the adhvaryus and the great ṛṣis indeed rose up in keen readiness.