Natyashastra
शम्या तत्र चतुर्थी च पञ्चमी तर्जनीक्रमात् । षष्ठश्च सन्निपातः स्यदेष वै षट्कलो विधिः ॥ ४५॥
There, the fourth is with the Śamyā, The fifth with the forefinger in succession, And the sixth is the combined strike— This is the method of the six-beat measure.
english translation
zamyA tatra caturthI ca paJcamI tarjanIkramAt । SaSThazca sannipAtaH syadeSa vai SaTkalo vidhiH ॥ 45॥
hk transliteration by Sanscript