Natyashastra
ततः स्थितलयो यो वै सन्निपातो विधीयते । स तु मध्यलयप्राप्य सन्निपातद्वयं भवेत् ॥ ३३७॥
Then, when the tempo becomes steady, the combination of beats known as Sannipāta is performed. It occurs in the middle tempo and consists of two Sannipātas (combinations or convergences of beats).
english translation
tataH sthitalayo yo vai sannipAto vidhIyate । sa tu madhyalayaprApya sannipAtadvayaM bhavet ॥ 337॥
hk transliteration by Sanscript