The Prophet ﷺ used to say in the morning, "O Allah, by You we have entered the morning, by You we have entered the evening, by You we live, by You we die, and to You is the resurrection."And in the evening he would say, "O Allah, by You we have entered the evening, by You we live, by You we die, and to You is the return."
حدثنا موسى بن إسمعيل حدثنا وهيب حدثنا سهيل عن أبيه
عن النبي ﷺ أنه كان يقول إذا أصبح اللهم بك أصبحنا وبك أمسينا وبك نحيا وبك نموت وإليك النشور وإذا أمسى قال اللهم بك أمسينا وبك نحيا وبك نموت وإليك النشور
[Its isnad is sahih] Tirmidhi narrated it in the Book of Supplications, chapter on what has been said about the supplication when morning comes and when evening comes, no. 3391, from the hadith of Suhayl bin Abu Salih, through him, and Ibn Hibban graded it sahih, no. 2354, 2355.