A bedouin came to the Prophet ﷺ and gave a pledge of allegiance for embracing Islam. The next day he came with fever and said (to the Prophet ﷺ ), "Please cancel my pledge (of embracing Islam and of emigrating to Medina)." The Prophet ﷺ refused (that request) three times and said, "Medina is like a furnace, it expels out the impurities (bad persons) and selects the good ones and makes them perfect."  

عَنْ جَابِرٍ ؓ جَاءَ أَعْرَابِيٌّ النَّبِيَّ ﷺ فَبَايَعَهُ عَلَى الإِسْلاَمِ فَجَاءَ مِنَ الْغَدِ مَحْمُومًا فَقَالَ أَقِلْنِي فَأَبَى ثَلاَثَ مِرَارٍ فَقَالَ الْمَدِينَةُ كَالْكِيرِ تَنْفِي خَبَثَهَا وَيَنْصَعُ طَيِّبُهَا  

A bedouin came to the Prophet ﷺ and said, "Please take my Pledge of allegiance for Islam." So the Prophet took from him the Pledge of allegiance for Islam. He came the next day with a fever and said to the Prophet ﷺ "Cancel my pledge." But the Prophet ﷺ refused and when the bedouin went away, the Prophet said, "Medina is like a pair of bellows (furnace): It expels its impurities and brightens and clears its good."  

جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ ﷺ فَقَالَ بَايِعْنِي عَلَى الإِسْلاَمِ فَبَايَعَهُ عَلَى الإِسْلاَمِ ثُمَّ جَاءَ الْغَدَ مَحْمُومًا فَقَالَ أَقِلْنِي فَأَبَى فَلَمَّا وَلَّى قَالَ الْمَدِينَةُ كَالْكِيرِ تَنْفِي خَبَثَهَا وَيَنْصَعُ طِيبُهَا  

[Machine] An Arab came to the Prophet ﷺ and pledged allegiance to him on Islam. The next day he came, looking disheveled, and said, "O Messenger of Allah, give me some of your wealth." The Prophet refused. He came to him for three consecutive days, each time saying, "O Messenger of Allah, give me some of your wealth," and each time the Prophet ﷺ refused. When he left, the Prophet ﷺ said, "Verily, Medina is like a furnace that purifies its impure and retains its good."  

جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ ﷺ فَبَايَعَهُ عَلَىالْإِسْلَامِ فَجَاءَ مِنَ الْغَدِ مَحْمُومًا فَقَالَ يَا رَسُولَ اللهِ أَقِلْنِي فَأَبَى فَجَاءَهُ ثَلَاثَةَ أَيَّامٍ مُتَوَالِيَةٍ كُلُّ ذَلِكَ يَقُولُ يَا رَسُولَ اللهِ أَقِلْنِي فَيَأْبَى النَّبِيُّ ﷺ فَلَمَّا وَلَّى قَالَ النَّبِيُّ ﷺ إِنَّ الْمَدِينَةَ كَالْكِيرِ تَنْفِي خَبَثَهَا وَيَنْصَعُ طَيِّبَهَا  

" جَاءَ أَعْرَابِىٌّ إِلَى النَّبِىِّ ﷺ فَبَايَعَهُ عَلَى الإِسْلاَمِ، فَجَاءَ مِنَ الْغَدِ مَحْمُومًا فَقَالَ: يَارَسُولَ الله أَقِلْنِى، فَأَبِى النَّبِىُّ ﷺ فَجَاءَهُ ثَلاَثَةَ أَيَّامٍ كُلَّ ذَلِكَ يَقُولُ: يَارَسُولَ الله! أَقِلْنِى بَيْعَتِى، فَأبَى النَّبِىُّ ﷺ فَلَمَّا وَلَّى قَالَ: النَّبِىُّ ﷺ : إِنَّ الْمَدِينَةَ كَالْكِيرِ تَنْفِى خَبَثَهَا وَتَنْصَعُ (*) طَيِّبَهَا ".