ye tv iha yathaivāmunā vihiṁsitā jantavaḥ paratra yama-yātanām upagataṁ ta eva ruravo bhūtvā tathā tam eva vihiṁsanti tasmād rauravam ity āhū rurur iti sarpād ati-krūra-sattvasyāpadeśaḥ
ye - those who; tu - but; iha - in this life; yathā - as much as; eva - certainly; amunā - by him; vihiṁsitāḥ - who were hurt; jantavaḥ - the living entities; paratra - in the next life; yama-yātanām upagatam - being subjected to miserable conditions by Yamarāja; te - those living entities; eva - indeed; ruravaḥ - rurus (a kind of envious animal); bhūtvā - becoming; tathā - that much; tam - him; eva - certainly; vihiṁsanti - they hurt; tasmāt - because of this; rauravam - Raurava; iti - thus; āhuḥ - learned scholars say; ruruḥ - the animal known as ruru; iti - thus; sarpāt - than the snake; ati-krūra - much more cruel and envious; sattvasya - of the entity; apadeśaḥ - the name.
According to Śrīdhara Svāmī, the ruru is also known as the bhāra-śṛṅga (ati-krūrasya bhāra-śṛṅgākhya-sattvasya apadeśaḥ saṁjñā). Śrīla Jīva Gosvāmī confirms this in his Sandarbha: ruru-śabdasya svayaṁ muninaiva ṭīkā-vidhānāl lokeṣv aprasiddha evāyaṁ jantu-viśeṣaḥ. Thus although rurus are not seen in this world, their existence is confirmed in the śāstras.