It is narrated from the mother of Bukayr that she sent her son Makhramah to Sayyidah Aishah (may Allah be pleased with her), who used to treat an ulcer that afflicts children. When Aishah (may Allah be pleased with her) had finished treating him, she saw two iron anklets on the child's feet. She asked: "Do you think that these iron anklets will ward off something that Allah has decreed for him? Had I seen them earlier, he would not have been treated by me. And by my life, silver anklets are purer than these two." This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.