Charak Samhita
अत्यर्थशङ्कितः स्याद्बहुवागथवाऽल्पवाग्विगतलक्ष्मीः । प्राप्तः प्रकृतिविकारं विषप्रदाता नरो ज्ञेयः ॥१०७॥
A person who behaves in an extremely suspicious manner, who is garrulous or who speaks very little, who has lost luster of his face and who exhibits changes in his characteristic features should be considered as a poison-giver.
english translation
atyarthazaGkitaH syAdbahuvAgathavA'lpavAgvigatalakSmIH । prAptaH prakRtivikAraM viSapradAtA naro jJeyaH ॥107॥
hk transliteration by Sanscript