"اللَّهُمَّ أَنْتَ رَبِّي لّا إِلَهَ إِلَّا أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ،

وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتَ،

أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتَ، أَبُوءُ لَكَ بِنِعْمَتِكَ عَلَيَّ،

وَأَبُوءُ بِذَنْبِي فَاغْفِر لِي فَإِنَّهُ لَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ".

Allaahumma 'Anta Rabbee laa 'ilaaha 'illaa 'Anta, khalaqtanee wa 'anaa 'abduka, wa 'anaa 'alaa 'ahdika wa wa'dika mas-tata'tu, 'a'oothu bika min sharri maa sana'tu, 'aboo'u laka bini'matika 'alayya, wa 'aboo'u bithanbee faghfir lee fa'innahu laa yaghfiruth-thunooba 'illaa 'Anta

O Allah, You are my Lord, there is none worthy of worship but You. You created me and I am your slave. I keep Your covenant, and my pledge to You so far as I am able. I seek refuge in You from the evil of what I have done. I admit to Your blessings upon me, and I admit to my misdeeds. Forgive me, for there is none who may forgive sins but You.

Reference:
Whoever recites this with conviction in the evening and dies during that night shall enter Paradise, and whoever recites it with conviction in the morning and dies during that day shall enter Paradise, Al-Bukhari

"اللَّهُمَّ إِنِّي أَصْبَحْتُ أُشْهِدُكَ وَأُشْهِدُ حَمَلَةَ عَرْشِكَ،

وَمَلَائِكَتَكَ وَجَمِيعَ خَلْقِكَ، أَنَّكَ أَنْتَ اللهُ لَا إِلَهَ إِلَّا أَنْتَ

وَحْدَكَ لَا شَرِيكَ لَكَ، وَأَنَّ مُحَمَّداً عَبْدُكَ وَرَسُولُكَ".

Allaahumma 'innee 'asbahtu 'ush-hiduka wa 'ush-hidu hamalata 'arshika, wa malaa'ikataka wajamee'a khalqika, 'annaka 'Antallaahu laa 'ilaaha 'illaa 'Anta wahdaka laa shareeka laka, wa 'anna Muhammadan 'abduka wa Rasooluka.

O Allah , I have entered a new morning ¹ and call upon You and upon the bearers of Your Throne , upon Your angels and all creation to bear witness that surely You are Allah , there is none worthy of worship but You alone , You have no partners, and that Muhammad is Your slave and Your Messenger . (Recite four times in Arabic.) ²

Reference:
¹ When you say this in the evening you should say, Allaahumma 'innee 'amsaytu. . . .: "O Allah, I have ended another day..."
² "Allah will spare whoever says this four times in the morning or evening from the fire of Hell, " Abu Dawud. It was also reported by Al-Bukhari in Al-'Adab Al-Mufrad, An-Nasa'i in 'Amalul-Yawm wal-Laylah and Ibn As-Sunni. Nasa'i's and Abu Dawud's chains of transmission are good (Hasan), Ibn Baz.