Riyad as-Salihin 1217
Sahl bin Sa'd (May Allah be pleased with him):
The Prophet (ﷺ) said, "In Jannah there is a gate which is called Ar-Raiyan through which only those who observe Saum (fasting) will enter on the Day of Resurrection. None else will enter through it. It will be called out, "Where are those who observe fasting?" So they will stand up and proceed towards it. When the last of them will have entered, the gate will be closed and then no one will enter through that gate." [Muslim] .
وعن سهل بن سعد رضي الله عنه عنه عن النبي صلى الله عليه وسلم قال‏:‏ ‏
"‏إن في الجنة بابًا يقال له‏:‏ الريان، يدخل منه الصائمون يوم القيامة لا يدخل منه أحد غيرهم يقال‏:‏ أين الصائمون‏؟‏ فيقومون  لا يدخل منه أحد غيرهم، فإذا دخلوا أغلق فلم يدخل منه أحد‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏