Dua 5
اَللّٰهُمَّ [اِنَّكَ] خَلَقْتَ نَفْسِيْ وَاَنْتَ تَوَفَّاهَا لَكَ مَمَاتُهَا وَمَحْيَاهَا اِنْ اَحْيَيْتَهَا فَاحْفَظْهَا وَاِنْ اَمَتَّهَا فَاغْفِرْ لَهَا، اَللّٰهُمَّ اِنِّيْٓ اَسْاَلُكَ الْعَافِيَةَ
O Allah! You created my soul and You will take it in death. To You alone (in Your hands alone) belong its death and its life. If You keep it alive, protect it, and if You cause it to die, forgive it. O Allah! Indeed, I ask You for well-being.
Sahih Muslim, no. (2712), the wording is his, Musnad Ahmad (2/79), where the words in square brackets are found.