Nimivaṃśānukīrtana (Genealogical Recitation of the Nimi Line) — with Atri–Soma Origin Motif
सुदुश्चरं नाम तपो येन तप्तं महात्पुरा / त्रीणि वर्षसहस्राणि दिव्यानीति हि नः श्रुतम्
suduścaraṃ nāma tapo yena taptaṃ mahātpurā / trīṇi varṣasahasrāṇi divyānīti hi naḥ śrutam
That great soul once performed the exceedingly arduous austerity called “Suduścara”; we have heard that it endured for three thousand divine years.