Prajāpati-vaṃśānukīrtana — Genealogical Enumeration of Progenitors
Dharma’s Line and the Sādhyas
वैकुण्ठा नाम ते साध्या बभूवुश्चाक्षुषेंऽतरे / उपस्थितेंऽतरे ह्यस्मिन्पुनर्वैवस्वतस्य ह
vaikuṇṭhā nāma te sādhyā babhūvuścākṣuṣeṃ'tare / upasthiteṃ'tare hyasminpunarvaivasvatasya ha
The Sadhyas known as “Vaikunthas” arose in the Caksusa Manvantara; and when this interval comes to pass, the Vaivasvata Manvantara follows again.