Overall meaning : Almighty Allah declares that even if He granted the wish of those who solemnly swear by Him, out of sheer defiance, if a sign comes to them they will believe, sent the angels down to them, raised the dead to speak of and confirm to them the Messenger’s truthfulness and gathered together before them all things before their very eyes—or group after group— to inform them of the Prophet’s truthfulness, they would still not believe, unless Allah willed otherwise; but most of them are ignorant of that.
He states that just as He has tried His Prophet, may Allah bless him and grant him peace, by making for him defiantly rebellious enemies from among humans and jinn, opposing him and denying his message, so, too, He made for every prophet of His defiantly rebellious enemies from among humans and jinn—the jinn devils whispering and suggesting to human devils specious words, by way of delusion, and thereby harassing prophets with false arguments and turning people away from the truth. Had he willed otherwise, He asserts, they would not have done so. Then, He instructs His Prophet, Muhammad, may Allah bless him and grant him peace, to leave them to their own inventions.
The jinn devils, He further states, whisper and suggest to human devils specious words, by way of delusion, so that the hearts of those who do not believe in the life to come may incline towards such deluding speech, and that these unbelievers may be well-pleased with it and persist in committing evil deeds because of such varnished falsehoods.