The Prophet ﷺ said, "The most superior way of asking for forgiveness from Allah is: 'Allahumma anta Rabbi la ilaha illa anta. Khalaqtani wa ana ʿAbduka, wa ana 'ala 'ahdika wa Wa'dika mastata'tu abu'u Laka bi ni 'matika wa abu'u Laka bidhanbi; faghfirli fa'innahu la yaghfiru-dh-dhunuba ill a ant a. A'uidhu bika min sharri ma sana'tu.' If somebody recites this invocation during the night, and if he should die then, he will go to Paradise (or he will be from the people of Paradise). And if he recites it in the morning, and if he should die on the same day, he will have the same fate."  

عَنِ النَّبِيِّ ﷺ قَالَ سَيِّدُ الاِسْتِغْفَارِ اللَّهُمَّ أَنْتَ رَبِّي لاَ إِلَهَ إِلاَّ أَنْتَ خَلَقْتَنِي وَأَنَا عَبْدُكَ وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ أَبُوءُ لَكَ بِنِعْمَتِكَ وَأَبُوءُ لَكَ بِذَنْبِي فَاغْفِرْ لِي فَإِنَّهُ لاَ يَغْفِرُ الذُّنُوبَ إِلاَّ أَنْتَ أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ إِذَا قَالَ حِينَ يُمْسِي فَمَاتَ دَخَلَ الْجَنَّةَ أَوْ كَانَ مِنْ أَهْلِ الْجَنَّةِ وَإِذَا قَالَ حِينَ يُصْبِحُ فَمَاتَ مِنْ يَوْمِهِ مِثْلَهُ  

from the Prophet ﷺ: "The master of seeking forgiveness from Allah is:

"allāhuma anta rabbī lā ilāha illā anta, khalaqtanī wa-ana ʿabduka, wa-ana ʿalá ʿahdika wa-waʿdika mā istaṭaʿtu, aʿūdhu bika min shari mā ṣanaʿtu, abūʾu laka bi-niʿmatika ʿalayya wa-abūʾu laka bi-dhanbī, fa-ighfir lī, fa-innahū lā yaghfiru al-dhunūba illā anta."

(O Allah, You are my Lord; there is no deity except You. You created me, and I am Your servant, and I am on the covenant and promise to the best of my ability. I seek refuge with You from the evil of what I have done, and I acknowledge Your favor upon me, and I confess my sins. So forgive me, for surely, there is none who forgives sins except You.)

He added, "If someone says it during the day with firm faith in it and dies on the same day before the evening, he will be from the people of Jannah; and if someone say it at night with firm faith in it, and dies before the morning, he will be from the people of Jannah."  

عَنِ النَّبِيِّ ﷺ: «سَيِّدُ الاِسْتِغْفَارِ أَنْ تَقُولَ:

(اللَّهُمَّ أَنْتَ رَبِّي لاَ إِلَهَ إِلاَّ أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ، وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ؛ أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ؛ أَبُوءُ لَكَ بِنِعْمَتِكَ عَلَىَّ، وَأَبُوءُ لَكَ بِذَنْبِي؛ فَاغْفِرْ لِي، فَإِنَّهُ لاَ يَغْفِرُ الذُّنُوبَ إِلاَّ أَنْتَ۔)»

قَالَ: «وَمَنْ قَالَهَا مِنَ النَّهَارِ مُوقِنًا بِهَا فَمَاتَ مِنْ يَوْمِهِ قَبْلَ أَنْ يُمْسِيَ فَهُوَ مِنْ أَهْلِ الْجَنَّةِ، وَمَنْ قَالَهَا مِنَ اللَّيْلِ وَهْوَ مُوقِنٌ بِهَا فَمَاتَ قَبْلَ أَنْ يُصْبِحَ فَهْوَ مِنْ أَهْلِ الْجَنَّةِ۔»  

The Prophet [SAW] said: "The best of prayers for forgiveness is for a person to say: 'Allahumma, anta rabbi, la ilaha illa anta, khalaqtani wa ana 'abduka, wa ana 'ala 'ahdika wa wa'dika mastata'tu, a'udhu bika min sharri ma sana'tu, abuw'u laka bidhanbi, wa abuw'u laka bini'matika 'alayya faghfirli, fa innahu la yaghfirudh-dhunuba illa anta (O Allah, You are my Lord, there is no god but You. You have created me and I am Your slave and I am keeping my promise and covenant to You as much as I can. I seek refuge with You from the evil of what I do. I acknowledge Your blessing and I acknowledge my sin, so forgive me, for there is none who can forgive sin except You.)' If he says this in the morning, believing in it firmly, and dies on that day before evening comes, he will enter Paradise, and if he says it in the evening, believing firmly in it, and dies before morning comes, he will enter Paradise." Al-Walid bin Tha'labah contradicted him.  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ سَيِّدَ الاِسْتِغْفَارِ أَنْ يَقُولَ الْعَبْدُ اللَّهُمَّ أَنْتَ رَبِّي لاَ إِلَهَ إِلاَّ أَنْتَ خَلَقْتَنِي وَأَنَا عَبْدُكَ وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ أَبُوءُ لَكَ بِذَنْبِي وَأَبُوءُ لَكَ بِنِعْمَتِكَ عَلَىَّ فَاغْفِرْ لِي فَإِنَّهُ لاَ يَغْفِرُ الذُّنُوبَ إِلاَّ أَنْتَ فَإِنْ قَالَهَا حِينَ يُصْبِحُ مُوقِنًا بِهَا فَمَاتَ دَخَلَ الْجَنَّةَ وَإِنْ قَالَهَا حِينَ يُمْسِي مُوقِنًا بِهَا دَخَلَ الْجَنَّةَ خَالَفَهُ الْوَلِيدُ بْنُ ثَعْلَبَةَ  

from the Prophet ﷺ who said: "If anyone says in the morning or in the evening: 'O Allah! You are my Lord; there is no god except You, You have created me, and I am Your servant and I hold on to Your covenant and promise as much as I can; I seek refuge in You from the evil of what I have done: I acknowledge Your favour upon me, and I acknowledge my sin. So pardon me, for none but You pardons sins,' and he dies during the daytime or during the night, he will enter Paradise."  

عَنِ النَّبِيِّ ﷺ قَالَ: «مَنْ قَالَ حِينَ يُصْبِحُ أَوْ حِينَ يُمْسِي: (اللَّهُمَّ أَنْتَ رَبِّي لاَ إِلَهَ إِلاَّ أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ، أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ، أَبُوءُ بِنِعْمَتِكَ وَأَبُوءُ بِذَنْبِي، فَاغْفِرْ لِي إِنَّهُ لاَ يَغْفِرُ الذُّنُوبَ إِلاَّ أَنْتَ) فَمَاتَ مِنْ يَوْمِهِ أَوْ مِنْ لَيْلَتِهِ دَخَلَ الْجَنَّةَ۔»  

his father said: "The Messenger of Allah (saas) said: Allahumma Anta Rabbi la ilaha illa Anta, khalaqtani wa ana 'abduka wa ana 'ala 'ahdika wa wa'dika mastata'tu. A'udhu bika min sharri ma sana'tu, abu'u bi ni'matika wa abu'u bi dhanbi faghfirli, fa innahu la yaghfirudh-dhunuba illa Anta (O Allah, You are my Lord, there is none worthy of worship except You. You have created me and I am Your slave, and I am adhering to Your covenant and Your promise as much as I can. I seek refuge with You from the evil of what I do. I acknowledge Your blessing and I acknowledge my sin, so forgive me, for there is none who can forgive sin except You)."He said: "The Messenger of Allah (saas) said: 'Whoever says this by day and by night, if he dies that day or that night, he will enter Paradise if Allah wills."  

قَالَ رَسُولُ اللَّهِ ﷺ اللَّهُمَّ أَنْتَ رَبِّي لاَ إِلَهَ إِلاَّ أَنْتَ خَلَقْتَنِي وَأَنَا عَبْدُكَ وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ أَبُوءُ بِنِعْمَتِكَ وَأَبُوءُ بِذَنْبِي فَاغْفِرْ لِي فَإِنَّهُ لاَ يَغْفِرُ الذُّنُوبَ إِلاَّ أَنْتَ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ مَنْ قَالَهَا فِي يَوْمِهِ وَلَيْلَتِهِ فَمَاتَ فِي ذَلِكَ الْيَوْمِ أَوْ تِلْكَ اللَّيْلَةِ دَخَلَ الْجَنَّةَ إِنْ شَاءَ اللَّهُ تَعَالَى