Sunan of Abu Dawood Book 29, Hadith 3855

حَدَّثَنَا حَفْصُ بْنُ عُمَرَ النَّمَرِيُّ، حَدَّثَنَا شُعْبَةُ، عَنْ زِيَادِ بْنِ عِلاَقَةَ، عَنْ أُسَامَةَ بْنِ شَرِيكٍ، قَالَ أَتَيْتُ النَّبِيَّ صلى الله عليه وسلم وَأَصْحَابُهُ كَأَنَّمَا عَلَى رُءُوسِهِمُ الطَّيْرُ فَسَلَّمْتُ ثُمَّ قَعَدْتُ فَجَاءَ الأَعْرَابُ مِنْ هَا هُنَا وَهَا هُنَا فَقَالُوا يَا رَسُولَ اللَّهِ أَنَتَدَاوَى فَقَالَ ‏ "‏ تَدَاوَوْا فَإِنَّ اللَّهَ عَزَّ وَجَلَّ لَمْ يَضَعْ دَاءً إِلاَّ وَضَعَ لَهُ دَوَاءً غَيْرَ دَاءٍ وَاحِدٍ الْهَرَمُ ‏"‏ ‏.‏

Narrated Usamah ibn Sharik: I came to the Prophet (ﷺ) and his Companions were sitting as if they had birds on their heads. I saluted and sat down. The desert Arabs then came from here and there. They asked: Messenger of Allah, should we make use of medical treatment? He replied: Make use of medical treatment, for Allah has not made a disease without appointing a remedy for it, with the exception of one disease, namely old age