Abdur Rahman bin Muhammad al-Maharbi عبد الرحمن بن محمد بن زياد المحاربي · The Book of Fasting

"For every good deed that the son of Adam does, he will have (the reward of) ten the like thereof, except for fasting. It is for Me and I shall reward for it.

"For those who fast there is a gate in Paradise called Ar-Rayyan, through which no one but they will enter. When the last of them has entered it, it will be closed. Whoever enters through it will drink, and whoever drinks will never thirst again."