Narrated Abu Umamah (RA):

Allah's Messenger (ﷺ) said:
"Whoever recites Ayat al-Kursi at the end of every obligatory prayer, nothing but death will prevent him from entering Paradise."

An-Nasa'i reported it, and Ibn Hibban graded it Sahih (authentic).

Bulugh al-Maram

https://sunnah.com/bulugh/2/220

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ٱللَّهُ لَآ إِلَـٰهَ إِلَّا هُوَ ٱلْحَىُّ ٱلْقَيُّومُ ۚ لَا تَأْخُذُهُۥ سِنَةٌۭ وَلَا نَوْمٌۭ ۚ لَّهُۥ مَا فِى ٱلسَّمَـٰوَٰتِ وَمَا فِى ٱلْأَرْضِ ۗ مَن ذَا ٱلَّذِى يَشْفَعُ عِندَهُۥٓ إِلَّا بِإِذْنِهِۦ ۚ يَعْلَمُ مَا بَيْنَ أَيْدِيهِمْ وَمَا خَلْفَهُمْ ۖ وَلَا يُحِيطُونَ بِشَىْءٍۢ مِّنْ عِلْمِهِۦٓ إِلَّا بِمَا شَآءَ ۚ وَسِعَ كُرْسِيُّهُ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضَ ۖ وَلَا يَـُٔودُهُۥ حِفْظُهُمَا ۚ وَهُوَ ٱلْعَلِىُّ ٱلْعَظِيمُ ٢٥٥

Allah! There is no god ˹worthy of worship˺ except Him, the Ever-Living, All-Sustaining. Neither drowsiness nor sleep overtakes Him. To Him belongs whatever is in the heavens and whatever is on the earth. Who could possibly intercede with Him without His permission? He ˹fully˺ knows what is ahead of them and what is behind them, but no one can grasp any of His knowledge—except what He wills ˹to reveal˺. His Seat1 encompasses the heavens and the earth, and the preservation of both does not tire Him. For He is the Most High, the Greatest.