the Prophet (saas) 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."
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