Charak Samhita
भवति चात्र- शीतेनोष्णकृतान् रोगाञ्छमयन्ति भिषग्विदः। ये तु शीतकृता रोगास्तेषामुष्णं भिषग्जितम् ॥४१॥
The intelligent physician treats disorders originating from heat (or hot sources) with cold measures and the disorders born of cold using hot measures.
english translation