Sahih al-Bukhari 247 (Book 4, Hadith 113)

Narrated Al-Bara ‘bin `Azib: 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, “Allahumma aslamtu wajhi ilaika, wa fauwadtu `Amri ilaika, wa alja’tu Zahri ilaika
raghbatan wa rahbatan ilaika. La Malja’a wa la manja minka illa ilaika. Allahumma amantu
bikitabika-l-ladhi anzalta wa bina-biyika-l ladhi arsalta” (O Allah! I surrender to You and entrust all
my affairs to You and depend upon You for Your Blessings both with hope and fear of You. There is
no fleeing from You, and there is no place of protection and safety except with You O Allah! I believe
in Your Book (the Qur’an) which You have revealed and in Your Prophet (Muhammad) 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 “Allahumma amantu bikitabika-l-ladhi anzalta (O Allah I believe in Your Book which You
have revealed).” I said, “Wa-rasulika (and your Apostle).” The Prophet (ﷺ) said, “No, (but say):
‘Wanabiyika-l-ladhi arsalta (Your Prophet whom You have sent), instead.”