Hadith 1382 — Sahih Muslim | en.tohed.com

#3353 Abu Hurairah (RA) reported Allah's Messenger (ﷺ) as saying: I have been commanded (to migrate) to a town (Madinah) which would overpower other towns. They (the people) call it Yathrib; its correct name is (in fact) Madinah. It eliminates (bad) people... #3354 This hadith has been narrated by Yahya bin Sa'id with the same chain of transmitters (and the words are): "Just as a furnace removes impurity," but no mention is made of iron....