Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 23
Sanskrit:
अव्याहतेष्टगतय: सुरसिद्धसाध्य-गन्धर्वयक्षनरकिन्नरनागलोकान् ।मुक्ताश्चरन्ति मुनिचारणभूतनाथ-विद्याधरद्विजगवां भुवनानि कामम् ॥ २३ ॥
ITRANS:
avyāhateṣṭa-gatayaḥ sura-siddha-sādhya-gandharva-yakṣa-nara-kinnara-nāga-lokānmuktāś caranti muni-cāraṇa-bhūtanātha-vidyādhara-dvija-gavāṁ bhuvanāni kāmam
Translation:
The nine Yogendras are liberated souls who travel freely to the planets of the demigods, the perfected mystics, the Sādhyas, the heavenly musicians, the Yakṣas, the human beings, and the minor demigods such as the Kinnaras and the serpents. No mundane force can check their free movement, and exactly as they wish they can travel as well to the worlds of the sages, the angels, the ghostly followers of Lord Śiva, the Vidyādharas, the brāhmaṇas and the cows.