Sahih Muslim | Book 35 | Hadith Number 6545
Narrated by al-Bara' b. 'Azib
This hadith has been transmitted on the authority of al-Bara' b. 'Azib with a slight variation of wording and there is this addition in the hadith transmitted on the authority of Husain: "In case you get up in the morning, you will get up with bliss.