Sahih Muslim 2204
Sahih Muslim · Book 39: The Book of Greetings · For Every Disease There Is A Remedy, And It Is Recommended To Treat Disease
Jabir reported Allah's Messenger (ﷺ) as saying:
حَدَّثَنَا هَارُونُ بْنُ مَعْرُوفٍ ، وَأَبُو الطَّاهِرِ ، وَأَحْمَدُ بْنُ عِيسَى ، قَالُوا حَدَّثَنَا ابْنُ وَهْبٍ ، أَخْبَرَنِي عَمْرٌو، - وَهُوَ ابْنُ الْحَارِثِ - عَنْ عَبْدِ رَبِّهِ بْنِ سَعِيدٍ ، عَنْ أَبِي الزُّبَيْرِ ، عَنْ جَابِرٍ ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ قَالَ " لِكُلِّ دَاءٍ دَوَاءٌ فَإِذَا أُصِيبَ دَوَاءُ الدَّاءِ بَرَأَ بِإِذْنِ اللَّهِ عَزَّ وَجَلَّ " .
There is a remedy for every malady, and when the remedy is applied to the disease it is cured with the permission of Allah, the Exalted and Glorious.