This hadith has been transmitted on the authority of al-Bara' b. 'Azib that Messenger of Allah 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.

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا أَبُو الأَحْوَصِ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْبَرَاءِ بْنِ، عَازِبٍ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ لِرَجُلٍ " يَا فُلاَنُ إِذَا أَوَيْتَ إِلَى فِرَاشِكَ " . بِمِثْلِ حَدِيثِ عَمْرِو بْنِ مُرَّةَ غَيْرَ أَنَّهُ قَالَ " وَبِنَبِيِّكَ الَّذِي أَرْسَلْتَ . فَإِنْ مُتَّ مِنْ لَيْلَتِكَ مُتَّ عَلَى الْفِطْرَةِ وَإِنْ أَصْبَحْتَ أَصَبْتَ خَيْرًا " .