Upakkilesasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 468

[468] Bhikkhus, iron is a corruption (upakkilesa) of gold. Gold defiled by that corruption is neither malleable nor workable nor radiant; it is brittle, and it is not properly fit for use.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.