Āyat al-Kursī
The verse of the throne
اللَّهُ لاَ إِلَٰهَ إِلاَّ هُوَ الْحَيُّ الْقَيُّومُ، لاَ تَأْخُذُهُ سِنَةٌ وَلاَ نَوْمٌ، لَهُ مَا فِي السَّمَاوَاتِ وَمَا فِي الأَرْضِ، مَنْ ذَا الَّذِي يَشْفَعُ عِنْدَهُ إِلاَّ بِإِذْنِهِ
Allāhu lā ilāha illā Huwa al-Ḥayyu al-Qayyūm, lā taʾkhudhuhu sinatun wa lā nawm, lahu mā fī as-samāwāti wa mā fī al-arḍ, man dhā alladhī yashfaʿu ʿindahu illā bi-idhnih.
"Allah — there is no god but He, the Living, the Sustainer. No drowsiness overtakes Him, nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who could intercede with Him except by His permission?"
Source: Qurʾan 2:255
The Prophet ﷺ said: whoever recites Āyat al-Kursī after every obligatory prayer, nothing stands between him and Paradise except death.
Where the scholars teach this duʿāʾ.
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"The Prophet, peace be upon him, said, I guarantee that whoever recites these twenty verses will be protected by Allah Almighty from every unjust devil, every rebellious devil, every harmful beast, and every hostile thief. The Verse of the Throne. Three verses from Al-A'raf starting with, Indeed, your Lord is Allah who created the heavens and the earth. Ten from Al-Saffat."
— Ibn al-Qayyim, The Wholesome Rain of Good Words
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"Allah said, O Moses, if I were to sleep, the heavens and the earth would collapse like the shattering of these vessels in your hands. Allah then revealed the verse of the throne, Ayat al-Kursi. It is narrated that Abu Huraira heard the messenger of Allah, peace be upon him, recounting from Moses, peace be upon him, from the pulpit."
— Ibn Kathir, Volume 1 — From Creation to Mūsā