It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) in a marfu' form that: "Allah has not sent down any disease except that He has also sent down its cure; whoever knows it, knows it, and whoever remains unaware of it, remains unaware."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4267
Hadith Gradingحکم دارالسلام:صحيح لغيره، على بن عاصم - و إن سمع من ابن السائب بعد اختلاطه - توبع.