[Machine] Fever is a heat that Allah sends upon His believing servant in this world. Their portion of it will be from the fire of Hell. Abu Tahir informed us, Abu Hamid narrated to us, Muhammad ibn Yahya narrated to us, Abu Mus'hir narrated to us, Sa'id ibn 'Abdul-'Aziz narrated to us from Isma'il ibn 'Ubayd Allah. He said, "I fell ill so Abu Salih al-Ash'ari came and informed me about Ka'b al-Ahbar and mentioned him."  

الْحُمَّى كِيرٌ مِنَ النَّارِ يَبْعَثُهَا اللهُ عَلَى عَبْدِهِ الْمُؤْمِنِ فِي الدُّنْيَا؛ فَتَكُونُ حَظَّهُ مِنْ نَارِ جَهَنَّمَ أَخْبَرَنَاهُ أَبُو طَاهِرٍ أنبأ أَبُو حَامِدٍ ثنا مُحَمَّدُ بْنُ يَحْيَى ثنا أَبُو مُسْهِرٍ ثنا سَعِيدُ بْنُ عَبْدِ الْعَزِيزِ عَنْ إِسْمَاعِيلَ بْنِ عُبَيْدِ اللهِ قَالَ مَرِضْتُ فَعَادَنِي أَبُو صَالِحٍ الْأَشْعَرِيُّ فَحَدَّثَنِي عَنْ كَعْبِ الْأَحْبَارِ فَذَكَرَهُ