Fasting is a practice that has always been recommended by health experts throughout history, and is practiced in religions other than Islam, such as Christianity, Budhism, and Hinduism. This article delves into the spiritual and epistemic features and benefits of fasting; it purges the root of lust, strengthens a person’s will power, and improves a person’s ability to contemplate. A person’s fast comes with restraining himself from immoral thoughts and actions, and has a lasting effect. Additionally, several narrations are offered to reveal its significance as well as its effects on people in this world and in the next.