وَحَدَّثَنِي مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ قَالَ سَمِعْتُ أَبَا الْحُبَابِ، سَعِيدَ بْنَ يَسَارٍ يَقُولُ سَمِعْتُ أَبَا هُرَيْرَةَ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " أُمِرْتُ بِقَرْيَةٍ تَأْكُلُ الْقُرَى يَقُولُونَ يَثْرِبُ . وَهِيَ الْمَدِينَةُ تَنْفِي النَّاسَ كَمَا يَنْفِي الْكِيرُ خَبَثَ الْحَدِيدِ " .
Malik related to me that Yahya ibn Said said, "I heardAbu'l-Hubab Said ibn Yasar say that he heard Abu Hurayra say that heheard 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 tosay, 'Yathrib,' but it is Madina. It removes the bad people like theblacksmith's furnace removes impurities from the iron.' " Translation Not Available
Book Ref: Muwatta Imam Malik Book 45 Hadith 1605
Web Ref: Muwatta Imam Malik Book 45 Hadith 5