(88) باب الْمَدِينَةِ تَنْفِي شِرَارَهَا
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (way peace be upon him) as saying:
I have been commanded (to migrate) to a town (Medina) which would overpower other towns. They (the people) call it Yathrib; its correct name is (in fact) Medina. It eliminates (bad) people just as a furnace removes the alloy of iron. (RU)
Reference (RU): Sahih Muslim 1382 a (RU)
In-book reference (RU): Book 15, Hadith 557 (RU)
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 3189 (RU)