Mbh 3.43.1a

Vaisampayana said, “And the city of Indra which Arjuna saw was delightful and was the resort of Siddhas and Charanas. And it was adorned with the flowers of every season, and with sacred trees of all kinds. And he beheld also celestial gardens called Nandana--the favourite resort of Apsaras. And fanned by the fragrant breezes charged with the farina of sweet-scented flowers, the trees with their lord of celestial blossoms seemed to welcome him amongst them. And the region was such that none could behold it who had not gone through ascetic austerities, or who had not poured libations on fire. It was a region for the virtuous alone, and not for those who had turned their back on the field of battle. And none were competent to see it who had not performed sacrifices or observed rigid vows, or who were without a knowledge of the Vedas, or who had not bathed in sacred waters, or who were not distinguished for sacrifices and gifts. And none were competent to see it who were disturbers of sacrifices, or who were low, or who drank intoxicating liquors, or who were violators of their preceptors’ bed, or who were eaters of (unsanctified) meat, or who were wicked. And having beheld those celestial gardens resounding with celestial music, the strong-armed son of Pandu entered the favourite city of Indra. And he beheld there celestial cars by thousands, capable of going everywhere at will, stationed in proper places. And he saw tens of thousands of such cars moving in every direction. And fanned by pleasant breezes charged with the perfumes of flowers, the son of Pandu was praised by Apsaras and Gandharvas. And the celestials then, accompanied by the Gandharvas and Siddhas and great Rishis, cheerfully reverenced Pritha’s son of white deeds. Benedictions were poured upon him, accompanied by the sounds of celestial music. The strong-armed son of Pritha then heard around him the music of conchs and drums.