Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 2
Sanskrit:
गुरुश्च रन्तिदेवश्च सङ्कृते: पाण्डुनन्दन ।रन्तिदेवस्य महिमा इहामुत्र च गीयते ॥ २ ॥
ITRANS:
guruś ca rantidevaś casaṅkṛteḥ pāṇḍu-nandanarantidevasya mahimāihāmutra ca gīyate
Translation:
O Mahārāja Parīkṣit, descendant of Pāṇḍu, Saṅkṛti had two sons, named Guru and Rantideva. Rantideva is famous in both this world and the next, for he is glorified not only in human society but also in the society of the demigods.