Abdur Rahman bin Yazid al-Nakha'i عبد الرحمن بن يزيد النخعي · The Book of Fasting

"Fasting is a shield against the Fire. Whoever starts the day of fasting, let him not act in an ignorant manner during that day. If anyone treats him in an ignorant maner, let him not insult him or curse him, rather let him say: "I am fasting.' By the One in whole hand is the soul of Muhammad, the smell that comes from the mouth of a fasting person is better before Allah than the fragrance of musk."

in Paradise there is a gate called Ar'Rayyan, it will be said on the Day of Resurrection: "Where are those who used to fast? Would you like to enter through Ar-Rayyan?" whoever enters through it will never thirst again. Then when they have entered it will be closed behind them, and no one but they will enter through it.