Messenger of Allah ﷺ entered upon a sick bedouin in whom he went to visit and said to him, "Don't worry, Tahur (i.e., your illness will be a means of cleansing of your sins), if Allah Will." The bedouin said, "Tahur! No, but it is a fever that is burning in the body of an old man and it will make him visit his grave." The Prophet ﷺ said, "Then it is so."
أَنَّ رَسُولَ اللَّهِ ﷺ دَخَلَ عَلَى أَعْرَابِيٍّ يَعُودُهُ فَقَالَ لاَ بَأْسَ عَلَيْكَ طَهُورٌ إِنْ شَاءَ اللَّهُ قَالَ قَالَ الأَعْرَابِيُّ طَهُورٌ بَلْ هِيَ حُمَّى تَفُورُ عَلَى شَيْخٍ كَبِيرٍ تُزِيرُهُ الْقُبُورَ قَالَ النَّبِيُّ ﷺ فَنَعَمْ إِذًا