"Where is that which you used to associate with Allah?" as His saying: "Where is that which you used to worship instead of Allah?"
﴿أَيْنَ مَا كُنْتُمْ تُشْرِكُونَ مِنْ دُونِ اللَّهِ﴾ كَقَوْلِه: ﴿أَيْنَ مَا كُنْتُمْ تَعْبُدُونَ من دون الله﴾