(Had We intended to take a pastime, We could surely have taken it from Us,) "Meaning, `From Ourself,' He is saying, `We would not have created Paradise or Hell or death or the resurrection or the Reckoning.'''
إِن كُنَّا فَـعِلِينَ
(if We were going to do (that). ) Qatadah, As-Suddi, Ibrahim An-Nakha`i and Mughirah bin Miqsam said: "This means, `We will not do that.''' Mujahid said, every time the word
(if) is used in the Qur'an, it is a negation.
بَلْ نَقْذِفُ بِالْحَقِّ عَلَى الْبَـطِلِ
(Nay, We fling the truth against the falsehood,) means, `We explain the truth and thus defeat falsehood.' Allah says:
فَيَدْمَغُهُ فَإِذَا هُوَ زَاهِقٌ
(so it destroys it, and behold, it disappears.) it is fading and vanishing.
(And woe to you) O you who say that Allah has offspring.
(for that which you ascribe.) that which you say and fabricate. Then Allah informs of the servitude of the angels, and how they persevere in worship night and day:
(Al-Masih will never be proud to reject being a servant of Allah, nor the angels who are the near. And whosoever rejects His worship and is proud, then He will gather them all together unto Himself.) 4:172
(nor are they weary.) means, they do not get tired or feel bored.
(who do not disobey Allah in what He commands them, but do what they are commanded) 66:6
Maududi - Sayyid Abul Ala Maududi - Tafhim al-Qur'an
This was to refute their entire conception of life which was based on the assumption that man was free to do whatever he liked, and there was none to call him to account or take him to task: that there was no life in the Hereafter where one's good deeds would be rewarded and evil deeds punished. In other words, this meant that the whole universe had been created without any serious purpose and therefore there was no need to pay any heed to the Message of the Prophet.
That is, "This world has been created with a definite purpose and not as a plaything; for, if he had wanted to enjoy a sport, We would have done so without creating a sentient, rational and responsible creature like you. Far be it from Us to put man to trial and conflict for the sake of mere fun."
That is, "The object for which this world has been created is to stage a conflict between the Truth and falsehood. And you yourselves know that in this conflict falsehood has always been defeated and destroyed: You should, therefore, consider this reality seriously, for, if you build the system of your life on the false presumption that it is mere fun, you will meet with the same consequences as the former people did, who presumed that the world was a mere show and pastime. Therefore you should reconsider your whole attitude towards the Message which has come to you. Instead of making fun of it and scoffing at the Messenger, you should take a warning from the fate of the former peoples."