Narrated Malik bin Sasaa (Radi-Allahu 'anhu):

The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "While I was at the House
in a state midway between sleep and wakefulness, (an angel recognized me)
as the man lying between two men. A golden tray full of wisdom and belief
was brought to me and my body was cut open from the throat to the lower
part of the abdomen and then my abdomen was washed with Zam-zam water and
(my heart was) filled with wisdom and belief. Al-Buraq, a white animal,
smaller than a mule and bigger than a donkey was brought to me and I set
out with Gabriel ('Alaihis-Salam).

When I reached the nearest heaven, Gabriel ('Alaihis-Salam) said to the
heaven gate-keeper, 'Open the gate.' The gatekeeper asked, 'Who is it?'. He
said, 'Gabriel.' The gate-keeper said,'Who is accompanying you?' Gabriel
('Alaihis-Salam) said, 'Muhammad.' The gate-keeper said, 'Has he been
called?' Gabriel ('Alaihis-Salam) said, 'Yes.' Then it was said, 'He is
welcomed. What a wonderful visit his is!' Then I met Adam ('Alaihis-Salam)
and greeted him and he said, 'You are welcomed O son and a Prophet.'

Then we ascended to the second heaven. It was asked, 'Who is it?' Gabriel
('Alaihis-Salam) said, 'Gabriel.' It was said, 'Who is with you?' He said,
'Muhammad.' It was asked, 'Has he been sent for?' He said, 'Yes.' It was
said, 'He is welcomed. What a wonderful visit his is!" Then I met Jesus
('Alaihis-Salam) and Yahya (John) ('Alaihis-Salam) who said, 'You are
welcomed, O brother and a Prophet.'

Then we ascended to the third heaven. It was asked, 'Who is it?' Gabriel
('Alaihis-Salam) said, 'Gabriel.' It was asked 'Who is with you?' Gabriel
('Alaihis-Salam) said, 'Muhammad.' It was asked, 'Has he been sent for?'
'Yes,' said Gabriel ('Alaihis-Salam). 'He is welcomed. What a wonderful
visit his is!' (The Prophet added). There I met Joseph (Yousuf'Alaihis-Salam) and
greeted him, and he replied, 'You are welcomed, O brother and a Prophet!'

Then we ascended to the 4th heaven and again the same questions and answers
were exchanged as in the previous heavens. There I met Idris
('Alaihis-Salam) and greeted him. He said, 'You are welcomed O brother and
Prophet.' Then we ascended to the 5th heaven and again the same questions
and answers were exchanged as in previous heavens. There I met and greeted
Aaron ('Alaihis-Salam) who said, 'You are welcomed O brother and a
Prophet".

Then we ascended to the 6th heaven and again the same questions and answers
were exchanged as in the previous heavens. There I met and greeted Moses
('Alaihis-Salam)who said, 'You are welcomed O brother and a Prophet.' When
I proceeded on, he (Moses) started weeping and on being asked why he was
weeping, he said, 'O Lord! Followers of this youth who was sent after me
will enter Paradise in greater number than my followers.'

Then we ascended to the seventh heaven and again the same questions and
answers were exchanged as in the previous heavens. There I met and greeted
Abraham ('Alaihis-Salam) who said, 'You are welcomed O son and a Prophet.'
Then I was shown Al-Bait-al-Ma'mur (i.e. Allah's House). I asked Gabriel
('Alaihis-Salam) about it and he said, 'This is Al Bait-ul-Ma'mur where
70,000 angels perform prayers daily and when they leave they never return
to it (but always a fresh batch comes into it daily).' Then I was shown
Sidrat-ul-Muntaha (i.e. a tree in the seventh heaven) and I saw its Nabk
fruits which resembled the clay jugs of Hajr (i.e. a town in Arabia), and
its leaves were like the ears of elephants, and four rivers originated at
its root, two of them were apparent and two were hidden. I asked Gabriel
('Alaihis-Salam) about those rivers and he said, 'The two hidden rivers are
in Paradise, and the apparent ones are the Nile and the Euphrates.'

Then fifty prayers were enjoined on me. I descended till I met Moses
('Alaihis-Salam) who asked me, 'What have you done?' I said, 'Fifty prayers
have been enjoined on me.' He said, 'I know the people better than you,
because I had the hardest experience to bring Bani Israel to obedience.
Your followers cannot put up with such obligation. So, return to your Lord
and request Him to reduce the number of prayers.' I returned and requested
Allah (for reduction) and He made it forty. I returned and (met Moses) and
had a similar discussion, and then returned again to Allah for reduction
and He made it thirty, then twenty, then ten, and then I came to Moses
('Alaihis-Salam) who repeated the same advice. Ultimately Allah reduced it
to five. When I came to Moses ('Alaihis-Salam) again, he said, 'What have
you done?' I said, 'Allah has made it five only.' He repeated the same
advice but I said that I surrendered (to Allah's Final Order)'" Allah's
Apostle (Sallallahu 'Alaihi Wa Sallam) was addressed by Allah, "I have
decreed My Obligation and have reduced the burden on My slaves, and I shall
reward a single good deed as if it were ten good deeds."

Bukhari Vol. 4 : No. 429