The Prophet ﷺ said, "Paradise has a gate called ar-Rayyan. On the Day of Resurrection it will be announced, 'Where are those who fasted? Come to ar-Rayyan.' When the last of them has entered, the gate will be shut."
حدثنا أحمد بن عبد الملك حدثنا حماد بن زيد عن أبي حازم
عن النبي ﷺ قال إن للجنة بابا يقال له الريان قال يقال يوم القيامة أين الصائمون هلموا إلى الريان فإذا دخل آخرهم أغلق ذلك الباب
Its chain of transmission is sahih. The hadith was narrated by Bukhari 4/110 no. 1896 (Fath), Muslim 2/808 no. 1152, Tirmidhi 3/128 no. 765, who said, hasan sahih ghareeb, Nasai 4/168 no. 2236, and Ibn Majah 1/525 no. 1640, all of them in the chapter on fasting.