Al-Baqara 2:255

Allah: none has the right to be worshiped except Him, the Ever-Living[143], All-Sustaining[144]. Neither drowsiness overtakes Him nor sleep[145]. To Him belongs all that is in the heavens and all that is on earth. Who is there that can intercede with Him except with His permission? He knows what was before them and what will be after them[146], while they encompass nothing of His knowledge, except what He wills. His Kursī[147] [i.e., footstool] extends over the heavens and earth, and safeguarding of both does not weary Him, for He is the Most High[148], the Most Great[149].[150]

[143] Whose life is perfect, complete, and eternal, without beginning or end.
[144] Dependent on none for His existence while being the sustainer of all created beings.
[145] Dozing off and falling asleep are but normal to all creation that are inherently frail.
[146] Allah's knowledge encompasses every aspect of His creations in the past, present and future.
[147] Chair or footstool. It is not to be confused with al-‘Arsh (the Throne), which is infinitely higher and greater than al-Kursī.
[148] Above all of His creations and superior to them in essence, rank, and position.
[149] Whose greatness is unlimited, beyond description or imagination.
[150] This verse is known as Āyat al-Kursī, lit. The verse of the Footstool. It is the greatest verse in the Qur’an.

Allāh - there is no deity except Him, the Ever-Living,[98] the Self-Sustaining.[99] Neither drowsiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who is it that can intercede with Him except by His permission? He knows what is [presently] before them and what will be after them,[100] and they encompass not a thing of His knowledge except for what He wills. His Kursī[101] extends over the heavens and the earth, and their preservation tires Him not. And He is the Most High,[102] the Most Great.[103]

[98] Whose life is perfect, complete and eternal, without beginning or end, and through whom all created life originated and continues.
[99] Dependent on none for His existence while being the sustainer and administrator of all created existence.
[100] Allāh's knowledge encompasses every aspect of His creations in the past, present and future.
[101] Chair or footstool. It is not to be confused with al-ʿArsh (the Throne) , which is infinitely higher and greater than al-Kursī.
[102] Above all of His creations and superior to them in essence, rank and position.
[103] Whose greatness is unlimited, beyond description or imagination.

255. Allâh! Lâ ilâha illa Huwa (none has the right to be worshipped but He), Al-Hayyul-Qayyum (the Ever Living, the One Who sustains and protects all that exists). Neither slumber nor sleep overtakes Him. To Him belongs whatever is in the heavens and whatever is on the earth. Who is he that can intercede with Him except with His Permission? He knows what happens to them (His creatures) in this world, and what will happen to them in the Hereafter. And they will never compass anything of His Knowledge except that which He wills. His Kursî [68] extends over the heavens and the earth, and He feels no fatigue in guarding and preserving them. And He is the Most High, the Most Great. [This Verse 2:255 is called Ayat-ul-Kursî ]

[68] (V.2:255). Kursî: literally a footstool or chair, and sometimes wrongly translated as Throne. The Kursî mentioned in this Verse should be distinguished from the ‘Arsh (Throne) mentioned in V.7:54, 10:3, 85:15 and elsewhere. Prophet Muhammad صلى الله عليه وسلم said: "The Kursî compared to the ‘Arsh is nothing but like a ring thrown out upon open space of the desert." If the Kursî extends over the entire universe, then how much greater is the ‘Arsh Indeed Allâh, the Creator of both the Kursî and the ‘Arsh , is the Most Great. Ibn Taimiyah said:
a) To believe in the Kursî
b) To believe in the ‘Arsh (Throne). It is narrated from Muhammad bin ‘Abdullâh and from other religious scholars that the Kursî is in front of the ‘Arsh (Throne) and it is at the level of the Feet. [Fatawa Ibn Taimiyah , Vol.5, Pages 54,55]
Narrated Abu Hurairah رضي الله عنه: Allâh’s Messenger صلى الله عليه وسلم ordered me to guard the Zakât revenue of Ramadân. Then somebody came to me and started stealing of the foodstuff. I caught him and said, "I will take you to Allâh’s Messenger صلى الله عليه وسلم!" Then Abu Hurairah described the whole narration and said: That person said (to me), "(Please don’t take me to Allâh’s Messenger صلى الله عليه وسلم and I will tell you a few words by which Allâh will benefit you). When you go to your bed, recite Ayat-ul-Kursî , (2:255) for then there will be a guard from Allâh who will protect you all night long, and Satan will not be able to come near you till dawn." (When the Prophet صلى الله عليه وسلم heard the story) he said (to me), "He (who came to you at night) told you the truth although he is a liar; and it was Satan." (Sahih Al-Bukhâri, Vol. 6, Hadîth No.530).

Allah! There is no deity save Him, the Alive, the Eternal. Neither slumber nor sleep overtaketh Him. Unto Him belongeth whatsoever is in the heavens and whatsoever is in the earth. Who is he that intercedeth with Him save by His leave? He knoweth that which is in front of them and that which is behind them, while they encompass nothing of His knowledge save what He will. His throne includeth the heavens and the earth, and He is never weary of preserving them. He is the Sublime, the Tremendous.