Natyashastra
आसारितोपवहनेष्वादावासारणानि युक्तानि । तान्यक्षराणि वक्ष्ये यानि पुरा ब्रह्मगीतानि ॥ १००॥
In the Upavahanas of the Āsāritas, the Āsāraṇās are employed at the beginning. I shall now speak about the syllables which were sung in the past by Brahman.
english translation
AsAritopavahaneSvAdAvAsAraNAni yuktAni । tAnyakSarANi vakSye yAni purA brahmagItAni ॥ 100॥
hk transliteration by Sanscript