Abbas - Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs
(And when those who ascribed partners to Allah behold those partners of theirs) their gods, (they will say: Our Lord!) O our Lord! (these are our partners) our gods (unto whom we used to cry instead of Thee) they commanded us to worship them. (But they will fling to them the saying) i.e. the idols will answer them and say: (Lo! ye verily are liars!) in what you say: we never commanded you to worship us nor were we aware of your worship.
And when the idolaters behold their associates, of devils and others, they will say, ‘Our Lord, these are our associates whom we used to invoke, [whom we used] to worship, besides You’. But they will fling to them the saying, that is, they will say to them: ‘You are indeed liars!’, when you say that you used to worship us — as is stated [by them] in another verse: ‘It was not us that they worshipped’ [Q. 28:63]; [and also in the verse] They will deny their worship of them [Q. 19:82].
Maududi - Sayyid Abul Ala Maududi - Tafhim al-Qur'an
The witness will be the Prophet of that community or his follower who invited that community to Tauhid and God-worship and warned it of the consequences of shirk and superstitious rites and customs and cautioned it against the accountability on the Day of Resurrection. He will bear witness of the fact that he had conveyed the true Message to those people, and that they committed evils deliberately and not in ignorance.
This does not mean that the criminals will not be given any opportunity to clear themselves but it means that their crimes will be proved to the hilt by means of irrefutable evidence which will leave no room for excuses.
That is, "They will not be given the opportunity to beg pardon of their Lord for their crimes. For that will be the time of judgment as the time of begging pardon would have ended long before this." The Qur'an and the Traditions are explicit on this point that the place for penitence is this world and not the Next World. Even in this world the opportunity is lost as soon as signs of death begin to appear, for the penitence at that time will be of no avail when a person knows that the time of his death has come. Respite for deeds expires as soon as one enters into the boundary of death, and the only thing that remains after that is the award of reward and punishment.
It does not mean that they would deny the fact that the mushriks used to invoke their help. They will call them liars in the sense that they had made them deities without their knowledge, information and permission, as if to say, "We never told you to leave Allah aside and pray to us for help. As a matter of fact, we never approved of this, nay, we were utterly unaware of this that you were invoking us. It was an utter lie that you considered us to be able to hear your prayers, answer them and help you out of your difficulties. As you yourselves were responsible for this shirk, why arc you involving us in its consequences?"
That is, "All those things on which they had relied will prove to be false, for they will not find anyone to hear their supplication nor anyone to remove their hardships. Nay, there will be none who will come forward and say, "These. are my dependents: so no action should be taken against them."
Double torment: one for their own disbelief and the other for hindering others from the Way of Allah.