Ibn al-Qayyim رحمه الله said: _“(By fasting) one narrows the passageways of Shayṭān within the servant (of Allāh), by narrowing the passageways of food and drink. As well, it restrains the force of the limbs from giving way to its dominating nature of that which is harmful to it in this world and the hereafter._ _And, (fasting) subdues every limb and might of the soul from (following its) whims, and harnesses it by its bridle._ _For, surely (the fast) is the bridle of the muttaqūn [the righteous, those having taqwá] and the shield of the warriors [a shield between them and the Hell-fire].”_ [Zaad al-Maʿad | 2/28-29]