Jami at-Tirmidhi 3391 (sahih, al-Albani)

كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُعَلِّمُ أَصْحَابَهُ يَقُولُ ‏ "‏ إِذَا أَصْبَحَ أَحَدُكُمْ فَلْيَقُلِ اللَّهُمَّ بِكَ أَصْبَحْنَا وَبِكَ أَمْسَيْنَا وَبِكَ نَحْيَا وَبِكَ نَمُوتُ وَإِلَيْكَ الْمَصِيرُ ‏.‏ وَإِذَا أَمْسَى فَلْيَقُلِ اللَّهُمَّ بِكَ أَمْسَيْنَا وَبِكَ أَصْبَحْنَا وَبِكَ نَحْيَا وَبِكَ نَمُوتُ وَإِلَيْكَ النُّشُورُ ‏"‏ ‏.‏

“Abu Hurairah (ra) said:The Messenger of Allah ﷺ used to teach his Companions, saying: “When one of you reached the morning, then let him say: ‘O Allah, by You we enter the morning, and by You we enter the evening, and be You we live, and by You we died, and to You is the Return (Allāhumma bika aṣbaḥnā wa bika amsainā wa bika naḥyā wa bika namūtu wa ilaikal-maṣīr). And when he reaches the evening let him say: ‘O Allah, by You we enter the evening, and by You we enter the morning, and by You we live, and by You we die, and to You is the Resurrection (Allāhumma bika amsainā wa bika aṣbaḥnā wa bika naḥyā wa bika namūtu wa ilaikan-nushūr).’””