Muwatta Malik 1602
موطأ مالك#1602SahihMalik related to me that Yahya ibn Said said, "I heard Abu'l-Hubab Said ibn Yasar say that he heard Abu Hurayra say that he heard the Messenger of Allah, may Allah bless him and grant him peace, say, 'I was ordered to a town which will eat up towns. They used to say, 'Yathrib,' but it is Madina. It removes the bad people like the blacksmith's furnace removes impurities from the iron
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih
In-book reference: 45:5