Natyashastra
चारीश्लोकं गदित्वा तु कृत्वा च परिवर्तनम् । तैरेव च पदः कार्यं पश्चिमेनापसर्पणम् ॥ १२३॥
After reciting the Chārī verse, one should perform a transformation. With the same feet, the movement of the westward retreat should be done.
english translation
cArIzlokaM gaditvA tu kRtvA ca parivartanam । taireva ca padaH kAryaM pazcimenApasarpaNam ॥ 123॥
hk transliteration by Sanscript