Natyashastra
माषघातो द्वादशकलस्तस्य पातविधिः स्व(स्त्व)यम् । कर्तव्या द्विकला शम्या तालो द्विकल एव च ॥ २७७॥
The Māṣaghāta consists of twelve Kalās, and its rule of Pāta is as follows: there should be a Śamyā of two Kalās, and a Tāla also of two Kalās.
english translation
mASaghAto dvAdazakalastasya pAtavidhiH sva(stva)yam । kartavyA dvikalA zamyA tAlo dvikala eva ca ॥ 277॥
hk transliteration by Sanscript