Say this dua four times in the evening:
اَللَّهُمَّ إِنِّي أَمْسَيْتُ أُشْهِدُكَ، وَأُشْهِدُ حَمَلَةَ عَرْشِكَ، وَمَلَائِكَتِكَ، وَجَمِيعَ خَلْقِكَ، أَنَّكَ أَنْتَ اللَّهُ لَا إِلَهَ إِلاَّ أَنْتَ وَحْدَكَ لَا شَرِيكَ لَكَ، وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُولُكَ
Pronunciation
Allaahumma 'innee 'amsaytu 'ush-hiduka wa 'ush-hidu hamalata 'arshika, wa malaa'ikatika wajamee'a khalqika, 'annaka 'AntAllahu laa 'ilaaha 'illaa 'Anta wahdaka laa shareeka laka, wa 'anna Muhammadan 'abduka wa Rasooluka.
Meaning
O Allah, verily I have reached evening and call on You, the bearers of Your throne, Your angels, and all of Your creation to witness that You are Allah, none has the right to be worshipped except You, alone, without any partner and that Muhammad is Your Servant and Messenger. Allah will spare whoever says this four times in the morning or evening from the Hell-fire.
Source: Hasan (Ibn Baz). Abu Dawud: 5069
Read the hadith
حَدَّثَنَا أَحْمَدُ بْنُ صَالِحٍ، حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي فُدَيْكٍ، قَالَ أَخْبَرَنِي عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ الْمَجِيدِ، عَنْ هِشَامِ بْنِ الْغَازِ بْنِ رَبِيعَةَ، عَنْ مَكْحُولٍ الدِّمَشْقِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم 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 " .
Narrated Anas ibn Malik: 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. [Hasan (Ibn Baz). Abu Dawud: 5069]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset