They will be questioned and rebuked for their mighty lies and false claims!
Allaah (The Most High) said:
وَيَوْمَ نَحْشُرُهُمْ جَمِيعًا ثُمَّ نَقُولُ لِلَّذِينَ أَشْرَكُوا أَيْنَ شُرَكَاؤُكُمُ الَّذِينَ كُنتُمْ تَزْعُمُونَ
ثُمَّ لَمْ تَكُن فِتْنَتُهُمْ إِلَّا أَن قَالُوا وَاللَّهِ رَبِّنَا مَا كُنَّا مُشْرِكِينَ
انظُرْ كَيْفَ كَذَبُوا عَلَىٰ أَنفُسِهِمْ ۚ وَضَلَّ عَنْهُم مَّا كَانُوا يَفْتَرُونَ
And on the Day when We shall gather them all together, We shall say to those who joined partners in worship (with Us): “Where are your partners (false deities) whom you used to assert (as partners in worship with Allah)? There will then be (left) no Fitnah (excuses or statements or arguments) for them but to say: “By Allah, our Lord, we were not those who joined others in worship with Allah. Look! How they lie against themselves! But the (lie) which they invented will disappear from them. [6:22-24]
Some reminders from Imaam Sadi (rahimahullaah):
Allaah (The Most High) informed us of the fate of the people of shirk on the day of judgement that they will be questioned and rebuked. It will be said to them: [أَيْنَ شُرَكَاؤُكُمُ الَّذِينَ كُنتُمْ تَزْعُمُون- Where are your partners (false deities) whom you used to assert (as partners in worship with Allah)?] Meaning: Indeed, Allaah has no partners; rather that was a (false claim) and a lie from yourselves.
[ثُمَّ لَمْ تَكُن فِتْنَتُهُمْ – There will then be (left) no Fitnah (excuses or statements or arguments) for them]; Meaning: They will not have any answers when tried and tested by way of this question, except that they will (attempt) to free themselves from their acts of shirk, saying ‘By Allaah, our Lord, we were not those who joined others in worship with Allaah.’’ Look at their affair in amazement and how they lie against themselves! They repeat the lie but only in loss and harm against themselves.
[وَضَلَّ عَنْهُم مَّا كَانُوا يَفْتَرُون – But the (lie) which they invented will disappear from them]; meaning: Those whom they used to assert as partners in worship with Allaah! Indeed, exalted and lofty is Allaah above all that they ascribe to Him as partners in worship!
Slightly paraphrased and abridged. For further details see Tayseer Al-Kareem Ar-Rahmaan Fee Tafseer Kalaam al-Mannaan of Imaam Sadi (rahimahullaah)