Ayat al-Kursi is verse 255 of the second chapter (Surah) of the Holy Quran, Surat al-Baqarah (The Chapter of the Cow)
Below is the Arabic text, the transliteration, and the English translation and then some of the benefits of reciting this verse, the Verse of the Throne:
اللَّهُ لاَ إِلَهَ إِلاَّ هُوَ الْحَيُّ الْقَيُّومُ لاَ تَأْخُذُهُ سِنَةٌ وَلاَ نَوْمٌ لَهُ مَا فِي السَّمَاوَاتِ وَمَا فِي الأَرْضِ مَنْ ذَا الَّذِي يَشْفَعُ عِنْدَهُ إِلاَّ بِإِذْنِهِ يَعْلَمُ مَا بَيْنَ أَيْدِيهِمْ وَمَا خَلْفَهُمْ وَلاَ يُحِيطُونَ بِشَيْءٍ مِنْ عِلْمِهِ إِلاَّ بِمَا شَاءَ وَسِعَ كُرْسِيُّهُ السَّمَاو ;َاتِ وَالأَرْضَ وَلاَ يَئُودُهُ حِفْظُهُمَا وَهُوَ الْعَلِيُّ الْعَظِيمُ
Allahu la ilaha illa Huwa, Al-Haiyul-Qaiyum La ta'khudhuhu sinatun wa la nawm, lahu ma fis-samawati wa ma fil-'ard Man dhal-ladhi yashfa'u 'indahu illa bi-idhnihi Ya'lamu ma baina aidihim wa ma khalfahum, wa la yuhituna bi shai'im-min 'ilmihi illa bima sha'a Wasi'a kursiyuhus-samawati wal ard, wa la ya'uduhu hifdhuhuma Wa Huwal 'Aliyul-Adheem
"Allah! There is no god but He - the Living, The Self-subsisting, Eternal. No slumber can seize Him Nor Sleep. His are all things In the heavens and on earth. Who is there can intercede In His presence except As he permitteth? He knoweth What (appeareth to His creatures As) Before or After or Behind them. Nor shall they encompass Aught of his knowledge Except as He willeth. His throne doth extend Over the heavens And on earth, and He feeleth No fatigue in guarding And preserving them, For He is the Most High. The Supreme (in glory)."
[Surah al-Baqarah 2: 255]
Ubayy bin Ka'b (radiAllahu anhu) reported: The Messenger of Allah (peace be upon him) said: "Abu Mundhir! Do you know which Ayah in Allah's Book is the greatest? I said: 'Allah and His messenger know best.'
He (peace be upon him) again said: 'Do you know which Ayah in Allah's Book, according to you, is the greatest?' I (Abu Mundhir) replied: ‘It is 'Allah la ilaha illa Huwal-Hayyul-Qayyum'.[2:255].
Thereupon he (peace be upon him) patted me in the chest and said, ' Rejoice by your knowledge, O Abu Mundhir! (i.e, may this knowledge be a source of respect, honour and benefit to you)'."
Asma' bint Yazid (radiAllahu anhu) reported, ' I heard the Messenger of Allah (peace be upon him) say about these two following Ayahs, i.e, verses: "Allah! There is no god but He - the Living, The Self-subsisting, Eternal. [2:255], And, Alif Lam Mim, Allah! There is no god but He - the Living, The Self-subsisting, Eternal [3:1-2], That they contain Allah's Greatest Name."
[Imam Ahmed bin Hanbal in his Musnad]
Abu Umamah Al-Bahili (may Allah be pleased with him) reported: The Prophet (peace be upon him) said: "The one who recites it after each of the obligatory prayers, then death will be the only thing preventing him from entering Paradise."
[Ibn Sunni, Ibn Hibban]
Abu Dhar said; O Messenger of Allah, what is the greatest thing that has been revealed to you?’ He said, Ayat al-Kursi, 'Allah! La ilaha illa Huwa'
When you lie down in your bed, recite ayat al-Kursi, Allah! La ilaha illa Huwa (none has the right to be worshipped but He), the Ever Living, the One Who sustains and protects all that exists… [al-Baraqah 2:255] until the end of the ayah, then you will have a protector from Allah and no shaytan (devil) will come near you until morning comes
Abu Hurairah (radiAllahu anhu) narrated; In Surah al-Baqaraah there is an ayah which is the best of all the ayahs of the Qur’an. It is never recited in a house but the Shaytan leaves: Ayat al-Kursi.
Everything has its pinnacle and the pinnacle of the Qur’an is Surah al-Baqarah. In it there is an ayah which is the greatest in the Qur’an: Ayat al-Kursi
Do you know the Ayatul Kursi?" Anas (radiAllahu anhu) replied "I know". The Prophet (Sallallahu alayhi wasallam) said, "It is equal to a quarter of the Qur'an.