Natyashastra
रूक्षो निर्भर्त्सनपरो रौद्रः सोऽयं स्वभावजः । चतुस्तालान्तरोत्क्षिप्तैः पादैस्त्वन्तरपातितैः ॥ ५३॥
This natural (swabhavaja) Terrible (Roudra) is rough and unyielding, with feet lifted and placed down at intervals of four Tālas.
english translation
rUkSo nirbhartsanaparo raudraH so'yaM svabhAvajaH । catustAlAntarotkSiptaiH pAdaistvantarapAtitaiH ॥ 53॥
hk transliteration by Sanscript