Natyashastra
निवृत्ततालः कर्तव्यः प्रवृत्तस्यापि तत्त्वतः । अत्र तालविधिः श्रेष्ठः प्रायः समुपवर्तनम् ॥ २५९॥
The Nivṛtta Tāla (ending rhythm) should be performed even for one that has been commenced. In this context, the proper rule of Tāla is that it generally involves a return movement (Samupavartana).
english translation
nivRttatAlaH kartavyaH pravRttasyApi tattvataH । atra tAlavidhiH zreSThaH prAyaH samupavartanam ॥ 259॥
hk transliteration by Sanscript