Natyashastra
शम्यातालौ तालशम्ये तेषु कुर्यात्क्रमेण तु । तालं शम्यां च तालं च सन्निपातं तथैव च ॥ २१८॥
In these, one should apply the śamya and tala alternately — first the tala on śamya, then śamya on tala, and likewise their combination (sannipata).
english translation
zamyAtAlau tAlazamye teSu kuryAtkrameNa tu । tAlaM zamyAM ca tAlaM ca sannipAtaM tathaiva ca ॥ 218॥
hk transliteration by Sanscript