The Messenger of Allah ﷺ said, "Seek treatment, servants of Allah, for Allah has not sent down any disease without also sending down its cure, except for death and old age."
حدثنا ابن زياد يعني المطلب بن زياد حدثنا زياد بن علاقة
أن رسول الله ﷺ قال تداووا عباد الله فإن الله عز وجل لم ينزل داء إلا أنزل معه شفاء إلا الموت والهرم
No references are available.
Its isnad is sahih. This wording was narrated by Tirmidhi 4/383, no. 2038, in "Medicine," the chapter on what was said about medicine and encouraging its use. He said, hasan sahih. Also narrated by Ibn Abu Shayba 1/146, 10/145, and Ibn Hibban 3195, Mawarid.