Natyashastra
एषोऽग्निवर्षधारानिरूपणे पुष्पवृष्टिपतने च । संयुतकरणः कार्यः प्रविरलचलिताङ्गुलिर्हस्तः ॥ २०॥
This hand, with fingers slightly spread and moving, should be used in combination to represent blazing fire, falling rain, and a shower of flowers.
english translation
eSo'gnivarSadhArAnirUpaNe puSpavRSTipatane ca । saMyutakaraNaH kAryaH praviralacalitAGgulirhastaH ॥ 20॥
hk transliteration by Sanscript