Mishkat al-Masabih 23 Medicine and Spells كتاب الطب والرقى 2

وَعَنْ جَابِرٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لِكُلِّ دَاءٍ دَوَاءٌ فَإِذَا أُصِيبَ دَوَاءٌ الدَّاءَ بَرَأَ بِإِذْنِ اللَّهِ» . رَوَاهُ مُسلم

Jabir reported God’s messenger as saying: “There is a medicine for every disease, and when the medicine is applied to the disease it is cured by God’s permission.” Muslim transmitted it.