Charak Samhita
आर्द्रं काष्ठं यथा वह्निर्विष्यन्दयति सर्वतः। तथा स्निग्धस्य वै दोषान् स्वेदो विष्यन्दयेत् स्थिरान्॥१२॥
Just like the fire propels the water out from the wet log wood, similarly the sudation propels out the stable doshas from the pre-oleated body.
english translation
ArdraM kASThaM yathA vahnirviSyandayati sarvataH। tathA snigdhasya vai doSAn svedo viSyandayet sthirAn॥12॥
hk transliteration by Sanscript