Prajāpati-vaṃśānukīrtana — Genealogical Enumeration of Progenitors
Dharma’s Line and the Sādhyas
तामसे हरयो नाम वैकुण्ठा रेवतान्तरे / ते साध्याश्चाक्षुषे नाम्ना छन्दजा जज्ञिरे सुराः
tāmase harayo nāma vaikuṇṭhā revatāntare / te sādhyāścākṣuṣe nāmnā chandajā jajñire surāḥ
In the Tāmāsa Manvantara they were called Harayas, and in the Revata Manvantara, Vaikuṇṭhas. In the Cākṣuṣa Manvantara they appeared as the Sādhyas—devas born of Chandas, the sacred metres.