Sahih al-Bukhari, 6313

Narrated Al-Bara bin `Azib:That the Prophet (ﷺ) advised a man, saying, "If you intend to lie down (i.e. go to bed), say, 'Allahumma aslamtu nafsi ilaika wa fauwadtu `Amri ilaika, wa wajjahtu wajhi ilaika wa alja'tu zahri ilaika, reghbatan wa rahbatan ilaika. La malja'a wa la manja minka illa ilaika. Amantu bikitabikal-ladhi anzalta; wa nabiyyikalladhi arsalta.' And if you should die then (after reciting this before going to bed) you will die on the religion of Islam

Rapporté par Al-Bara bin `Azib : Le Prophète (ﷺ) a conseillé à un homme en disant : « Si tu veux t’allonger (c’est-à-dire aller dormir), dis : ‘Allahumma aslamtu nafsi ilaika wa fauwadtu `amri ilaika, wa wajjahtu wajhi ilaika wa alja'tu zahri ilaika, reghbatan wa rahbatan ilaika. La malja'a wa la manja minka illa ilaika. Amantu bikitabikal-ladhi anzalta ; wa nabiyyikalladhi arsalta.’ Et si tu meurs après avoir récité cela avant de dormir, tu mourras dans la religion de l’Islam. »