Arthashastra
कृष्ण सर्प मुखे गृह गोलिका मुखे वा सप्त रात्र उषिता गुज्जाः कुष्ठ योगः ॥
(The application of the paste prepared from) gunja seeds kept previously for seven nights in the mouth of a white cobra or in the mouth of a house-lizard brings on leprosy.
english translation
kRSNa sarpa mukhe gRha golikA mukhe vA sapta rAtra uSitA gujjAH kuSTha yogaH ॥
hk transliteration by Sanscript