Charak Samhita
भल्लातकास्थ्यग्निसमंतन्मांसंस्वादुशीतलम्। पञ्चमःफलवर्गोऽयमुक्तःप्रायोपयोगिकः ॥१६५॥ इतिफलवर्गः॥५॥
The marking-nut/bhallataka (Semecarpus anacardium Linn.f) is caustic like fire but the pulp of the fruit is sweet and cold in potency. Thus, is described the fifth section about fruits generally in use.
english translation
bhallAtakAsthyagnisamaMtanmAMsaMsvAduzItalam। paJcamaHphalavargo'yamuktaHprAyopayogikaH ॥165॥ itiphalavargaH॥5॥
hk transliteration by Sanscript