(88) باب الْمَدِينَةِ تَنْفِي شِرَارَهَا
This hadith has been narrated by Yabya b. Sa'id with the same chain of transmitters (and the words are):
" Just as a furance removes impurity," but no mention is made of iron.
Reference: Sahih Muslim 1382 b
In-book reference: Book 15, Hadith 558
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 3190