It is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Paradise has a gate called al-Rayyan. Those who fast will be called to it, and it will be said to them: Come. Then when they have all entered, that gate will be closed, and no one else will enter along with them."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5915