It was narrated from Abu Salam, the servant of the Prophet ﷺ, that :
the Prophet ﷺ said: "There is no Muslim - or no person, or slave (of Allah) - who says, in the morning and evening: 'Radaytu billahi Rabban wa bil-Islami dinan wa bi Muhammadin nabiyyan (I am content with Allah as my Lord, Islam as my religion and Muhammad as my Prophet),' but he will have a promise from Allah to make him pleased on the Day of Resurrection."

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، حَدَّثَنَا مِسْعَرٌ، حَدَّثَنَا أَبُو عَقِيلٍ، عَنْ سَابِقٍ، عَنْ أَبِي سَلاَّمٍ، خَادِمِ النَّبِيِّ ﷺ عَنِ النَّبِيِّ ﷺ قَالَ " مَا مِنْ مُسْلِمٍ أَوْ إِنْسَانٍ أَوْ عَبْدٍ يَقُولُ حِينَ يُمْسِي وَحِينَ يُصْبِحُ رَضِيتُ بِاللَّهِ رَبًّا وَبِالإِسْلاَمِ دِينًا وَبِمُحَمَّدٍ نَبِيًّا - إِلاَّ كَانَ حَقًّا عَلَى اللَّهِ أَنْ يُرْضِيَهُ يَوْمَ الْقِيَامَةِ " .