Natyashastra
चतुर्भिस्तु भवेन्मात्रा त्रिमात्रं वस्तुसञ्ज्ञितम् । पातांश्चैव प्रवक्ष्यामि पादभागैर्यथाक्रमम् ॥ २२७॥
Four [Kalās] will make one Mātrā and three Mātrās will make one Vastu. In giving the Pādabhāgas I shall speak of the Pāta in due order. [This is as follows].
english translation
caturbhistu bhavenmAtrA trimAtraM vastusaJjJitam । pAtAMzcaiva pravakSyAmi pAdabhAgairyathAkramam ॥ 227॥
hk transliteration by Sanscript