Cintāmaṇi-gṛha Antara-kathana (Account of the Inner Chambers of the Cintāmaṇi Palace) — Lalitopākhyāna Context
हस्तविंशतिरुन्नमं चतुर्नल्वप्रविस्तरम् / नित्यान्तरमिति प्रोक्तं नित्याः पञ्चदशात्र वै
hastaviṃśatirunnamaṃ caturnalvapravistaram / nityāntaramiti proktaṃ nityāḥ pañcadaśātra vai
Its height is twenty hastas and its breadth four nalvas; this is called “Nityāntara”, and here indeed are the fifteen eternal Nityās.