Ayatul Kursi - The Greatest Ayah of the Qur’an

اللهُ لَا إِلٰهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ لَا تَأْخُذُهُ سِنَةٌ وَلَا نَوْمٌ لَهُ مَا فِي السَّمَاوَاتِ وَمَا فِي الْأَرْضِ مَنْ ذَا الَّذِي يَشْفَعُ عِنْدَهُ إِلَّا بِإِذْنِهِ يَعْلَمُ مَا بَيْنَ أَيْدِيهِمْ وَمَا خَلْفَهُمْ وَلَا يُحِيطُونَ بِشَيْءٍ مِنْ عِلْمِهِ إِلَّا بِمَا شَاءَ وَسِعَ كُرْسِيُّهُ السَّمَاوَاتِ وَالْأَرْضَ وَلَا يَئُودُهُ حِفْظُهُمَا وَهُوَ الْعَلِيُّ الْعَظِيمُ

Allāhu lā ilāha illā Huwa al-Ḥayyul-Qayyūm.
Lā taʾkhudhuhū sinatun wa lā nawm.
Lahū mā fis-samāwāti wa mā fil-arḍ.
Man dhālladhī yashfaʿu ʿindahū illā biʾidhnīh.
Yaʿlamu mā bayna aydīhim wa mā khalfahum.
Wa lā yuḥīṭūna bishayʾin min ʿilmihī illā bimā shāʾ.
Wasiʿa kursiyyuhus-samāwāti wal-arḍ.
Wa lā yaʾūduhū ḥifẓuhumā,
wa Huwa al-ʿAliyyul-ʿAẓīm.

Reference:
Whoever says this upon rising in the morning will be protected from the jinn until evening, and whoever says it in the evening will be protected from them until morning.

Reported by al-Ḥākim (1/562).
Graded ṣaḥīḥ by al-Albānī in Ṣaḥīḥ at-Targhīb wa at-Tarhīb (1/273). He traced it to an-Nasāʾī and aṭ-Ṭabarānī, who, according to al-Albānī, narrates it with a jayyid (reliable) chain of transmission.