This hadith has been transmitted on the authority of al-Bara' b. 'Azib that Allah's Messenger (ﷺ) said to a person:
O, so and so, as you go to your bed; the rest of the hadith is the same but with this variation of wording that he said:" Thine Apostle whom Thou sent." If you die that night you would die on Fitra and if you get up in the morning you would get up with a bliss.