Gaṇḍasutta
“Seyyathāpi, bhikkhave, gaṇḍo anekavassagaṇiko. Tassassu gaṇḍassa nava vaṇamukhāni nava abhedanamukhāni. Tato yaṁ kiñci pagghareyya— asuciyeva pagghareyya, duggandhaṁyeva pagghareyya, jegucchiyaṁyeva pagghareyya; yaṁ kiñci pasaveyya— asuciyeva pasaveyya, duggandhaṁyeva pasaveyya, jegucchiyaṁyeva pasaveyya.
The Simile of the Boil
“Mendicants, suppose there was a boil that was many years old. And that boil had nine orifices that were continually open wounds. Whatever oozed out of them would be filthy, stinking, and disgusting. Whatever exuded from them would be filthy, stinking, and disgusting.