How the number of Salaat reduced from fifty to five

The greatest moment in the life of the Holy Prophet (Saw) arrived when he was admitted into the divine presence of Allah himself, during the incident of Mi'raj. He was instructed to order his community to observe Salaah 50 times a day. 

The Holy Prophet (Saw) said: “Allaah enjoined upon my ummah 50 prayers, and I came back until I passed by 

Moosa who said, ‘What has Allaah enjoined upon your ummah?’

I said, ‘He has enjoined 50 prayers.’ 

He said, ‘Go back to your Lord, for your ummah will not be able to bear that.’ 

So I went back and He reduced it. Then I came back to Moosa and said, ‘He has reduced it.’ 

He said, ‘Go back to your Lord, for your ummah will not be able to bear that.’ 

So I went back and He reduced it further. Then I came back to Moosa and said, ‘He has reduced it further.’ 

He said, ‘Go back to your Lord, for your ummah will not be able to bear that.’ 

So I went back and He said,"These are five prayers and they are all (equal to) fifty (in reward). The Sentence that comes from Me cannot be changed [cf. Qaaf 50:29]."

Then I went back to Moosa and he said, ‘Go back to your Lord.’ But I said, ‘I feel shy (to ask again) before my Lord.’…” 

(Bukhari)