Saṃkhyāvarta (संख्यावर्त्त): Commencement of Yajña at the Dawn of Tretāyuga
तस्मादहिंसा धर्मस्य द्वारमुक्तं महर्षिभिः / ऋषिकोटिसहस्राणि स्वतपोभिर्दिवं ययुः
tasmādahiṃsā dharmasya dvāramuktaṃ maharṣibhiḥ / ṛṣikoṭisahasrāṇi svatapobhirdivaṃ yayuḥ
Therefore the great rishis declared ahimsa to be the gate of dharma; countless rishis—by their own austerities—went to the heavenly realm.