Short answer
Al-Rayyan is a gate of Paradise reserved for those who fasted. The Prophet ﷺ said that on the Day of Judgement it will be called out: where are the fasting people? They will enter through it, no one else will, and then it will be closed. Its name comes from the word for quenched thirst.
A matter of belief and virtue. The hadith is in Sahih al-Bukhari and is accepted by all the schools.
The four schools agree on this.
Explanation
Sahl ibn Sa'd reported that the Prophet ﷺ said: in Paradise there is a gate called al-Rayyan, through which the fasting people will enter on the Day of Resurrection, and no one else will enter it. It will be said, where are those who fasted? They will stand, and none but them will enter it. When they have entered, it will be locked, and no one else will go through it.
The name. Rayyan comes from the Arabic root for having one's thirst quenched. Those who went thirsty for Allah are given a gate whose very name promises the opposite.
Who are "the fasting people"? The scholars explain that it means those for whom fasting was a distinct part of their life: Ramadan done well, and voluntary fasts beyond it. In another hadith the Prophet ﷺ mentioned gates for the people of prayer, jihad, charity and fasting, and Abu Bakr asked whether anyone would be called from all of them. The Prophet ﷺ replied that he hoped Abu Bakr would be one of them.
- Keep your Ramadan fasts sincerely and completely.
- Make up any you missed. See the qada calculator.
- Add regular voluntary fasts. See the sunnah fasts.
See also Jannah in Islam and fasting is for Me.
The evidence
Sahih al-Bukhari 1896
Sahih... إن في الجنة بابا يقال له الريان يدخل منه الصائمون يوم القيامة ...
"In Paradise there is a gate called al-Rayyan, through which the fasting people will enter on the Day of Resurrection."
The gate of al-Rayyan is for those who fast.
Sahih al-Bukhari 1897
Sahih... ومن كان من أهل الصيام دعي من باب الريان ...
"Whoever was among the people of fasting will be called from the gate of al-Rayyan."
Those known for fasting are called from this gate.
Checked by our team. For a more accurate answer to your own situation, consult a scholar. Quran translation by Sahih International. Hadith Arabic from the standard editions of the six books and the Muwatta, with gradings as recorded there; the English is our own rendering. Spotted a mistake? Tell us.