Natyashastra
आद्यस्तु जनितो भूत्वा स एवास्कन्दितो भवेत् । अपसर्पी पुनर्वामः शकटास्यश्च दक्षिणः ॥ ६३॥
The first movement is generated, and then it should be performed with an ascent. The retreating movement should follow with the left side (Vāmā) and the 'Shakatāsya' on the right (Dakṣiṇa).
english translation
Adyastu janito bhUtvA sa evAskandito bhavet । apasarpI punarvAmaH zakaTAsyazca dakSiNaH ॥ 63॥
hk transliteration by Sanscript