Natyashastra
सर्वे हस्तप्रचाराश्च प्रयोगेषु यथाविधिः नेत्रभ्रूमुखरागैश्च कर्तव्या व्यञ्जिअता बुधैः ॥ १७१॥
All hand movements, in accordance with their proper use, should be accompanied by appropriate expressions of the eyes, eyebrows, and face, as understood by the wise.
english translation
sarve hastapracArAzca prayogeSu yathAvidhiH netrabhrUmukharAgaizca kartavyA vyaJjiatA budhaiH ॥ 171॥
hk transliteration by Sanscript