Skanda Purana 7.20.322

7.20.322

nandinaḥ kāryāt prasannena mahādevena pārvatyā anumodena nandine varadānam . sāyaṃ sandhyopāsanānantaraṃ sagaṇasya somasya mahādevasya harṣānnṛtyācaraṇam . aśokataruputragrahaṇārthaṃ mahādevājñayā pārvatyāstadrātrau yathoktaniyamenāvasthānam, paredyuḥ prabhāta eva pārvatyā bhartrā saha aśokatarupotasannidhau gamanam, brahmādidevānāṃ maharṣi- pravarāṇāmanyeṣāṃ ca mahataḥ samājasya tatropasthitiḥ, umayā ' śokatarupotakasya vastrabhūṣādinā samalaṃkaraṇam . viprāṇāṃ vedaghoṣaiḥ puṇyādvaśabdaiśca guñjāyamāne harṣollāsayukte mahotsave gṛhītaviprānujñayāmayā savidhyaśoka- tarugrahaṇam, somena śivena samyaksabhājitānāṃ satkṛtānāṃ pūjitānāṃ tarpitānāṃ viprāṇāṃ devādīnāṃ ca svasvasthānagamanam, aśokataruputragrahaṇamahotsavasamāptiḥ .

Mahādeva, pleased with Nandin's work, bestows a boon upon Nandin with Pārvatī's assent; after the evening twilight worship, Mahādeva, accompanied by Umā and his gaṇas, dances with joy; by Mahādeva's command, Pārvatī observes the prescribed vows that night in order to adopt the Aśoka tree as a son; the next day, at dawn itself, Pārvatī goes with her husband near the young Aśoka tree; the arrival there of Brahmā and the other gods, the foremost great seers, and a vast assembly of others; Umā's decorating the young Aśoka tree with garments, ornaments, and the like; amid the great festival filled with joy and delight, resounding with the Vedic chants and auspicious shouts of the brahmins, Umā, having received permission from the brahmins, adopts the nearby Aśoka tree according to rite; the brahmins, gods, and others, properly honored, entertained, worshiped, and gratified by Śiva along with Umā, depart to their respective abodes; the conclusion of the great festival of adopting the Aśoka tree as a son.