When the Prophet ﷺ set out for (the battle of) Uhud, some of those who had gone out with him, returned. The companions of the Prophet ﷺ were divided into two groups. One group said, "We will fight them (i.e. the enemy)," and the other group said, "We will not fight them." So there came the Divine Revelation:-- '(O Muslims!) Then what is the matter within you that you are divided. Into two parties about the hypocrites? Allah has cast them back (to disbelief) Because of what they have earned.' (4.88) On that, the Prophet ﷺ said, "That is Taiba (i.e. the city of Medina) which clears one from one's sins as the fire expels the impurities of silver."  

لَمَّا خَرَجَ النَّبِيُّ ﷺ إِلَى أُحُدٍ رَجَعَ نَاسٌ مِمَّنْ خَرَجَ مَعَهُ وَكَانَ أَصْحَابُ النَّبِيِّ ﷺ فِرْقَتَيْنِ فِرْقَةً تَقُولُ نُقَاتِلُهُمْ وَفِرْقَةً تَقُولُ لاَ نُقَاتِلُهُمْ فَنَزَلَتْ {فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ وَاللَّهُ أَرْكَسَهُمْ بِمَا كَسَبُوا} وَقَالَ إِنَّهَا طَيْبَةُ تَنْفِي الذُّنُوبَ كَمَا تَنْفِي النَّارُ خَبَثَ الْفِضَّةِ  

Some of the companions of the Prophet ﷺ returned from the battle of Uhud (i.e. refused to fight) whereupon the Muslims got divided into two parties; one of them was in favor of their execution and the other was not in favour of it. So there ware revealed: "Then what is the matter with you that you are divided into two parties about the hypocrites?" (4.88). Then the Prophet ﷺ said "It (i.e. Medina) is a Taybah (good), it expels impurities as the fire expels the impurities of silver."  

رَجَعَ نَاسٌ مِنْ أَصْحَابِ النَّبِيِّ ﷺ مِنْ أُحُدٍ وَكَانَ النَّاسُ فِيهِمْ فِرْقَتَيْنِ فَرِيقٌ يَقُولُ اقْتُلْهُمْ وَفَرِيقٌ يَقُولُ لاَ۔ فَنَزَلَتْ {فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ} وَقَالَ: «إِنَّهَا طَيْبَةُ: تَنْفِي الْخَبَثَ كَمَا تَنْفِي النَّارُ خَبَثَ الْفِضَّةِ۔»  

from Zaid bin Thabit that he heard about this Ayah: Then what is the matter with you that you are divided into two parties about the hypocrites? (4:88) He said: "People among the Companions of the Prophet ﷺ returned on the Day of Uhud and there were two parties among them, a group who said: 'Kill them,' and a group that say not to. So Allah revealed this Ayah: Then what is the matter with you that you are divided into two parties about the hypocrites? (4:88) So he said: "Indeed it is Taibah (Al-Madinah). And he said: 'It expels filth from it just like the fire expels filth from iron.'"  

أَنَّهُ قَالَ فِي هَذِهِ الآيَةِ ( فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ ) قَالَ رَجَعَ نَاسٌ مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ يَوْمَ أُحُدٍ فَكَانَ النَّاسُ فِيهِمْ فَرِيقَيْنِ فَرِيقٌ يَقُولُ اقْتُلْهُمْ وَفَرِيقٌ يَقُولُ لاَ فَنَزَلَتْ هَذِهِ الآيَةُ ( فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ ) وَقَالَ إِنَّهَا طِيبَةُ وَقَالَ إِنَّهَا تَنْفِي الْخَبِيثَ كَمَا تَنْفِي النَّارُ خَبَثَ الْحَدِيدِ  

Some of the companions of the Prophet ﷺ returned from the battle of Uhud (i.e. refused to fight) whereupon the Muslims got divided into two parties; one of them was in favor of their execution and the other was not in favour of it. So there ware revealed: "Then what is the matter with you that you are divided into two parties about the hypocrites?" (4.88). Then the Prophet ﷺ said "It (i.e. Medina) is a Taybah (good), it expels impurities as the fire expels the impurities of silver." (Using translation from Bukhārī 4589)   

فِي هَذِهِ الْآيَةِ فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ وَاللهُ أَرْكَسَهُمْ بِمَا كَسَبُوا قَالَ رَجَعَ نَاسٌ مِنْ أَصْحَابِ رَسُولِ اللهِ ﷺ مِنْ أُحُدٍ فَكَانَ النَّاسُ فِيهِمْ فِرْقَتَيْنِ فَرِيقٌ مِنْهُمْ يَقُولُ اقْتُلْهُمْ وَفَرِيقٌ يَقُولُ لَا فَنَزَلَتِ الْآيَةُ فَمَا لَكُمْ فِي الْمُنَافِقِينَ فِئَتَيْنِ وَقَالَ إِنَّهَا تَنْفِي الْخَبَثَ كَمَا تَنْفِي النَّارُ خَبَثَ الْفِضَّةِ