Saṃkhyāvarta (संख्यावर्त्त): Commencement of Yajña at the Dawn of Tretāyuga
तस्मान्न निश्चयाद्वक्तुं धर्मः शक्यस्तु केनचित् / देवानृषीनुपादाय स्वायंभुवमृते मनुम्
tasmānna niścayādvaktuṃ dharmaḥ śakyastu kenacit / devānṛṣīnupādāya svāyaṃbhuvamṛte manum
Therefore, without taking refuge in the gods and the rishis—except for Svāyambhuva Manu—no one can speak of dharma with certainty.