Natyashastra
अथार्धेऽन्ते च मात्राणां पञ्चानां पात इष्यते । तालः शम्यार्धतालश्च शम्यातालस्तथैव च ॥ २९१॥
At the latter half and end of the five Mātrās, a Pāta should occur. It will consist of Tāla, Śamyā, half Tāla, and Śamyā-Tāla in the same order.
english translation
athArdhe'nte ca mAtrANAM paJcAnAM pAta iSyate । tAlaH zamyArdhatAlazca zamyAtAlastathaiva ca ॥ 291॥
hk transliteration by Sanscript