﴿ إِذْ قَالَ لِأَبِيهِ وَقَوْمِهِۦ مَا هَٰذِهِ ٱلتَّمَاثِيلُ ٱلَّتِىٓ أَنتُمْ لَهَا عَٰكِفُونَ ﴾

“when he said unto his father and his people, “What are these images to which you are so intensely devoted?””

Please check ayah 21:56 for complete tafsir.