Prajāpati-vaṃśānukīrtana — Genealogical Enumeration of Progenitors
Dharma’s Line and the Sādhyas
संप्राप्ते चैव कल्पान्ते सप्तरशिमर्दिवाकरः / भूत्वा संवर्त्तकादित्यस्त्रींल्लोकांश्च दहत्युत
saṃprāpte caiva kalpānte saptaraśimardivākaraḥ / bhūtvā saṃvarttakādityastrīṃllokāṃśca dahatyuta
When the end of the Kalpa is reached, the seven-rayed Sun, assuming the form of Samvartaka Aditya, burns up even the three worlds.