Ar-Rayyaan

Sahl Ibn Sa`d, may Allaah be pleased with him, reported
that the Prophet, sallallaahu alayhi wa sallam, said:

“In Paradise there is a gate which is called Ar-Rayyaan
through which only those who observe 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].