عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْمَعِدَةُ حَوْضُ الْبَدَنِ وَالْعُرُوقُ إِلَيْهَا وَارِدَةٌ فَإِذَا صَحَّتِ الْمَعِدَةُ صَدَرَتِ الْعُرُوقُ بِالصِّحَّةِ وَإِذَا فَسَدَتِ الْمَعِدَةُ صَدَرَتِ الْعُرُوقُ بِالسقمِ»
Abu Huraira reported God’s messenger as saying:“The stomach is the tank of the body and the veins go down to it. When the stomach is healthy the veins come back in a healthy condition, but when it is in a bad condition they return diseased.”