The Prophet ﷺ said: If anyone says in the morning or in the evening: "O Allah! in the morning we call Thee, the bearers of Thy Throne, Thy angels and all Thy creatures to witness that thou art Allah (God) than Whom alone there is no god, and that Muhammad is Thy Servant and Apostle," Allah will emancipate his fourth from Hell; if anyone says twice, Allah will emancipate his half; if anyone says it thrice, Allah will emancipate three-fourth; and if he says four times, Allah will emancipate him from Hell.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَالَ حِينَ يُصْبِحُ أَوْ يُمْسِي اللَّهُمَّ إِنِّي أَصْبَحْتُ أُشْهِدُكَ وَأُشْهِدُ حَمَلَةَ عَرْشِكَ وَمَلاَئِكَتَكَ وَجَمِيعَ خَلْقِكَ أَنَّكَ أَنْتَ اللَّهُ لاَ إِلَهَ إِلاَّ أَنْتَ وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُولُكَ أَعْتَقَ اللَّهُ رُبْعَهُ مِنَ النَّارِ فَمَنْ قَالَهَا مَرَّتَيْنِ أَعْتَقَ اللَّهُ نِصْفَهُ وَمَنْ قَالَهَا ثَلاَثًا أَعْتَقَ اللَّهُ ثَلاَثَةَ أَرْبَاعِهِ فَإِنْ قَالَهَا أَرْبَعًا أَعْتَقَهُ اللَّهُ مِنَ النَّارِ  

The Prophet ﷺ said: If anyone says in the morning: "O Allah! in the morning we call Thee, the bearers of Thy Throne, Thy angels, and all Thy creatures to witness that Thou art Allah than Whom there is no god, Thou being alone and without a partner, and that Muhammad is Thy servant and Thy Apostle," Allah will forgive him any sins that he commits that day; and if he repeats them in the evening. Allah will forgive him any sins he commits that night.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ قَالَ حِينَ يُصْبِحُ اللَّهُمَّ إِنِّي أَصْبَحْتُ أُشْهِدُكَ وَأُشْهِدُ حَمَلَةَ عَرْشِكَ وَمَلاَئِكَتَكَ وَجَمِيعَ خَلْقِكَ أَنَّكَ أَنْتَ اللَّهُ لاَ إِلَهَ إِلاَّ أَنْتَ وَحْدَكَ لاَ شَرِيكَ لَكَ وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُولُكَ إِلاَّ غُفِرَ لَهُ مَا أَصَابَ فِي يَوْمِهِ ذَلِكَ مِنْ ذَنْبٍ وَإِنْ قَالَهَا حِينَ يُمْسِي غُفِرَ لَهُ مَا أَصَابَ تِلْكَ اللَّيْلَةَ  

“Whoever says in the morning: ‘O Allah we have reached morning, calling You to witness, and calling the carriers of Your Throne to witness, and Your angels, and all of Your creation, that You are Allah, none has the right to be worshipped but You, Alone, without partner, and that Muhammad ﷺ is Your slave and Your Messenger. (Allāhumma aṣbaḥnā nush-hiduka wa nush-hidu ḥamalata ʿarshika wa malā’ikataka wa jamīʿa khalqika bi-annaka Allāh, lā ilāha illā anta, waḥdaka lā sharīka laka, wa anna Muḥammadan ʿabduka wa rasūluk)’ Allah will forgive him for whatever he does that day, and if he says it in the evening, Allah will forgive him for whatever sin he commits that night.”  

سَمِعْتُ أَنَسًا يَقُولُ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَالَ حِينَ يُصْبِحُ اللَّهُمَّ أَصْبَحْنَا نُشْهِدُكَ وَنُشْهِدُ حَمَلَةَ عَرْشِكَ وَمَلاَئِكَتَكَ وَجَمِيعَ خَلْقِكَ بِأَنَّكَ الله لاَ إِلَهَ إِلاَّ أَنْتَ وَحْدَكَ لاَ شَرِيكَ لَكَ وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُولُكَ إِلاَّ غَفَرَ اللَّهُ لَهُ مَا أَصَابَ فِي يَوْمِهِ ذَلِكَ وَإِنْ قَالَهَا حِينَ يُمْسِي غَفَرَ اللَّهُ لَهُ مَا أَصَابَ فِي تِلْكَ اللَّيْلَةِ مِنْ ذَنْبٍ  

"مَنْ قَال حينَ يُصْبِحُ أَوْ حينَ يُمْسِي: اللَّهُمَّ إِنِّي أَصْبَحْتُ أُشْهدُكَ وَأُشْهِدُ حَمَلَةَ عَرْشِكَ، وَمَلائِكَتَكَ، وَجَمِيعَ خَلْقِكَ أَنَّكَ أَنْتَ الله، لا إِلهَ إلا أَنْتَ، وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُولُكَ، أَعْتَقَ الله رُبْعَهُ مِنَ النَّارِ، فَمَنْ قَالهَا مَرَّتينِ أَعْتَقَ الله نِصْفَهُ، فَمَنْ قَالهَا ثَلاثًا أَعْتَقَ الله ثَلاثَةَ أَرْبَاعِهِ، فَإِنْ قَالهَا أَرْبَعًا أَعْتَقَهُ الله مِنَ النَّارِ".