פירוש על מלכים א 8:51

The smelting pot of iron. The earthenware²⁹Alternatively, give a non-Jew anything he asks for, as incentive that he turn to God with his prayers, and to publicize God’s Presence in the Beis Hamikdosh.—Ralbag utensils used to purify gold of its impurities is called כור.³⁰The phrase “of iron” refers to the purpose of the pot, not the material of which it is made. The pot itself is earthenware.