299. hadíth
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «اَلدَّاءُ ثَلاَثَةٌ وَ اَلدَّوَاءُ ثَلاَثَةٌ فَأَمَّا اَلدَّاءُ فَالدَّمُ وَ اَلْمِرَّةُ وَ اَلْبَلْغَمُ فَدَوَاءُ اَلدَّمِ اَلْحِجَامَةُ وَ دَوَاءُ اَلْبَلْغَمِ اَلْحَمَّامُ وَ دَوَاءُ اَلْمِرَّةِ اَلْمَشِيُّ.
The Messenger of Allah (saws) said: "Disease is of three types, and the cure is of three types : As for the ailments, they are blood, bile, and phlegm. The cure for blood is with cupping, the cure for phlegm is the bathhouse, and the cure for bile is walking."