Dua before going to sleep entrusting yourself to Allah

The Prophet ﷺ said to me, "Whenever you go to bed perform ablution like that for the prayer, lie or your right side and say:

allāhumma aslamtu wajhī ilayka, wa-fawwaḍtu amrī ilayka, wa-aljaʾtu ẓahrī ilayka, raghbatan wa-rahbatan ilayka, lā maljaʾa wa-lā manjā minka illā ilayka. allāhumma āmantu bi-kitābika alladhī anzalta, wa-bi-nabiyyika alladhī arsalta.

(O Allah, I have submitted myself to You, entrusted my affairs to You, and sought refuge with You, turning to You in hope and fear. There is no refuge and no escape from You except toward You. O Allah, I believe in Your Book which You have revealed, and in Your Prophet whom You have sent).

Then if you die on that very night, you will die with faith (i.e. or the religion of Islam). Let the aforesaid words be your last utterance (before sleep)."

I repeated it before the Prophet ﷺ and when I reached "allāhumma āmantu bi-kitābika alladhī anzalta" (O Allah I believe in Your Book which You have revealed)." I said, "wa-rasūlika" (and your Apostle). The Prophet ﷺ said, "No, (but say): 'wa-nabiyika alladhī arsalta" (Your Prophet whom You have sent), instead.  

قَالَ النَّبِيُّ ﷺ إِذَا أَتَيْتَ مَضْجَعَكَ فَتَوَضَّأْ وُضُوءَكَ لِلصَّلاَةِ ثُمَّ اضْطَجِعْ عَلَى شِقِّكَ الأَيْمَنِ ثُمَّ قُلِ:

(اللَّهُمَّ أَسْلَمْتُ وَجْهِي إِلَيْكَ، وَفَوَّضْتُ أَمْرِي إِلَيْكَ، وَأَلْجَأْتُ ظَهْرِي إِلَيْكَ، رَغْبَةً وَرَهْبَةً إِلَيْكَ، لاَ مَلْجَأَ وَلاَ مَنْجَا مِنْكَ إِلاَّ إِلَيْكَ۔ اللَّهُمَّ آمَنْتُ بِكِتَابِكَ الَّذِي أَنْزَلْتَ، وَبِنَبِيِّكَ الَّذِي أَرْسَلْتَ۔)

فَإِنْ مُتَّ مِنْ لَيْلَتِكَ فَأَنْتَ عَلَى الْفِطْرَةِ وَاجْعَلْهُنَّ آخِرَ مَا تَتَكَلَّمُ بِهِ

قَالَ فَرَدَّدْتُهَا عَلَى النَّبِيِّ ﷺ فَلَمَّا بَلَغْتُ اللَّهُمَّ آمَنْتُ بِكِتَابِكَ الَّذِي أَنْزَلْتَ قُلْتُ وَرَسُولِكَ قَالَ لاَ وَنَبِيِّكَ الَّذِي أَرْسَلْتَ