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1.
Narrated Shaddad bin Aus:
The Prophet (ﷺ) said "The most superior way of asking for forgiveness from Allah is: 'Allahumma anta Rabbi la ilaha illa anta, Anta Khalaqtani wa ana `Abduka, wa ana 'ala ahdika wa wa'dika mastata'tu, A`udhu bika min Sharri ma sana'tu, abu'u Laka bini'matika 'alaiya, wa abu'u laka bidhanbi faghfir lee fa innahu la yaghfiru adhdhunuba illa anta." The Prophet (ﷺ) added. "If somebody recites 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 Paradise; and if somebody recites it at night with firm faith in it, and dies before the morning, he will be from the people of Paradise."
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
2.
Narrated Abu Huraira:
I heard Allah's Messenger (ﷺ) saying." By Allah! I ask for forgiveness from Allah and turn to Him in repentance more than seventy times a day."
حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ قَالَ أَبُو هُرَيْرَةَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " وَاللَّهِ إِنِّي لأَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ فِي الْيَوْمِ أَكْثَرَ مِنْ سَبْعِينَ مَرَّةً ".
Reference : Sahih al-Bukhari 6307
In-book reference : Book 80, Hadith 4
USC-MSA web (English) reference : Vol. 8, Book 75, Hadith 319
3. Narrated Al-Bara bin `Azib:
Allah's Messenger (ﷺ) said to me, "When you want to go to bed, perform ablution as you do for prayer, then lie down on your right side and say: 'Allahumma aslamtu wajhi ilaika, wa fawwadtu 'amri ilaika wa alja'tu dhahri ilaika, raghbatan wa rahbatan ilaika, la malja'a wa la manja minka illa ilaika. Amantu bikitabik al-ladhi anzalta wa binabiyyika al-ladhi arsalta'. If you should die then (after reciting this) you will die on the religion of Islam (i.e., as a Muslim); so let these words be the last you say (before going to bed)" While I was memorizing it, I said, "Wa birasulika al-ladhi arsalta (in Your Apostle whom You have sent).' The Prophet (ﷺ) said, "No, but say: Wa binabiyyika al-ladhi arsalta (in Your Prophet whom You have sent).
اللَّهُمَّ أَسْلَمْتُ وَجْهِي إِلَيْكَ، وَفَوَّضْتُ أَمْرِي إِلَيْكَ، وَأَلْجَأْتُ ظَهْرِي إِلَيْكَ، رَغْبَةً وَرَهْبَةً إِلَيْكَ، لاَ مَلْجَأَ وَلاَ مَنْجَا مِنْكَ إِلاَّ إِلَيْكَ، آمَنْتُ بِكِتَابِكَ الَّذِي أَنْزَلْتَ، وَبِنَبِيِّكَ الَّذِي أَرْسَلْتَ
Reference : Sahih al-Bukhari 6311
In-book reference : Book 80, Hadith 8
USC-MSA web (English) reference : Vol. 8, Book 75, Hadith 323
4.
Narrated Hudhaifa:
When the Prophet (ﷺ) went to bed, he would say: "Bismika amutu wa ahya." and when he got up he would say:" Al-hamdu li l-lahil-ladhi ahyana ba'da ma amatana wa ilaihin-nushur."
بِاسْمِكَ أَمُوتُ وَأَحْيَا
الْحَمْدُ لِلَّهِ الَّذِي أَحْيَانَا بَعْدَ مَا أَمَاتَنَا وَإِلَيْهِ النُّشُورُ
Reference : Sahih al-Bukhari 6312
In-book reference : Book 80, Hadith 9
USC-MSA web (English) reference : Vol. 8, Book 75, Hadith 324