When Allaah created Paradise and Hell, He sent Jibril to Paradise and said: Look at it and at what I have prepared for its people in it.
Jibril looked at it, then he came back and said: By Your Glory, no one will hear of it but he will enter it.
So Allaah commanded that it be surrounded by hardships and said: Go and look at it and at what I have prepared for its people in it.
Jibril looked at it and saw that it had been surrounded with hardships.
Jibril said: By Your Glory, I fear that no one will enter it.
Allaah said: Go and look at the Fire and at what I have prepared for its people in it.
So Jibril looked at it and parts of it were piled upon other parts.
He came back and said: By Your Glory, no one will enter it.
So Allaah commanded that it be surrounded with pleasures and said: Go and look at it.
So Jibril looked at it and saw that it was surrounded with pleasures.
Jibril came back and said: By Your Glory, I fear that no one will be saved from it and everyone will enter it.
Source: Sunan an-Nasaa’i (3763)
Source: Jami‘ at-Tirmidhi 28/2758