Qur'aanic Verse 2:255:
255. Allahu la ilaha illa huwa alhayyu alqayyoomu la ta/khuthuhu sinatun wala nawmun lahu ma fee alssamawati wama fee al-ardi man tha allathee yashfaAAu AAindahu illa bi-ithnihi yaAAlamu ma bayna aydeehim wama khalfahum wala yuheetoona bishay-in min AAilmihi illa bima shaa wasiAAa kursiyyuhu alssamawati waal-arda wala yaooduhu hifthuhuma wahuwa alAAaliyyu alAAatheemu
255. Allah! None besides Him is worthy of worship. HE is for ever living, abiding. Neither slumber nor sleep overtakes Him ever. To Him belongs whatever there is in the heavens and in/on the earth. Who could intercede with Him, except by His leave? 482, 483 HE knows what is in their hands and what is behind them.484 And none can take anything of His knowledge except for what He wills. His seat of authority encompasses the heavens and the earth, and their upkeep tires Him not. And He is the One High above anything, the One Immensely Great.485
482. In the light of the very categorical statement in the preceding Verse that there shall be no intercession on the Day of Judgment, this statement here in the form of an interrogation could only mean emphatic reiteration of that earlier statement. In Allah's presence, no one – not even a Prophet – can dare intercede on one's own initiative, against His Judgment or Will. That is what the interrogative statement here signifies. And if Allah gives permission for any Prophet or Angel to intercede, it means that it is, first of all, Allah's Own Will to pardon the person concerned.
483. It is absolutely important to understand this matter of intercession correctly. In the absence of this understanding, we're likely to fall into a satanic trap, and commit the abominable sin of shirk. Most Christians have already fallen into this trap. They have come to believe, absolutely, that whatever sins they commit here in this world, their Jesus is sure to intercede with God on their behalf and give them an assured entry into Paradise. See now what has happened to the Christians. They have forgotten God almost entirely, and have taken to the worship of Jesus and his mother, Mary. This happening, in front of us all, has provided enough proof that if any group of persons considers any Prophet – or anyone else for that matter – as endowed with the power of intercession, that group is sure to raise that Prophet/person to divinity, and thus commit shirk. Most Muslims today are, I am afraid, dangerously close to following in the Christians' footsteps.
484. Verse 34.9 tells us, "Do they not then consider what is in their hands and what is behind them of the heaven and the earth? ..." This sentence in that Verse gives us a pretty good idea of the divine meaning of the Arabic term maa bayna aydihim wa maa khalfahum, translated literally here as 'what is in their hands and what is behind them'. The context there of the heaven and the earth indicates that 'what is in their hands' means 'what is in their knowledge' or 'what they are capable of knowing'. And 'what is behind them' means 'what is not in their knowledge' or 'what they are not capable of knowing'. The same divine meaning has to be made applicable here to the very same phrase used in Verse 2.255 that we are presently studying.
485. This beautiful Verse is generally known as 'aayatul kursi' because of the word kursi (seat of authority) occurring therein. Along with Chapter 112 of the Qur'aan, this Verse gives us a comprehensive divine description of Allah, our Creator, and our Lord.
The above is extracted from Qur'aanic Studies Manzil I.