《太平广记·卷三十·神仙三十》
有一天，他让杨德祖把鼎、锅、铪、锲等铁器弄到药房里来，他亲自把这些东西打碎，把碎铁垒起来加上炭，用烈火煅烧。
一日，令德祖取鼎釜铪锲辈陈于药房中，凡自击碎之，垒铁加炭，烈火以煅焉。
One day, he asked Yang Dezong to carry ironware, such as tripod, pot, gong, and chime, to his dispensary. He personally crushed them, piled up the iron shards, added coal, and burned them with intense fire.