43:20
وَقَالُوا۟ لَوْ شَآءَ ٱلرَّحْمَـٰنُ مَا عَبَدْنَـٰهُم ۗ مَّا لَهُم بِذَٰلِكَ مِنْ عِلْمٍ ۖ إِنْ هُمْ إِلَّا يَخْرُصُونَ
And they said, "If the Most Merciful had willed, we would not have worshipped them." They have of that no knowledge. They are not but falsifying.
Context in Surah Az-Zukhruf
Nearby ayahs help place verse 43:20 in sequence and meaning.
أَوَمَن يُنَشَّؤُا۟ فِى ٱلْحِلْيَةِ وَهُوَ فِى ٱلْخِصَامِ غَيْرُ مُبِينٍ
So is one brought up in ornaments while being during conflict unevident [attributed to Allah]?
وَجَعَلُوا۟ ٱلْمَلَـٰٓئِكَةَ ٱلَّذِينَ هُمْ عِبَـٰدُ ٱلرَّحْمَـٰنِ إِنَـٰثًا ۚ أَشَهِدُوا۟ خَلْقَهُمْ ۚ سَتُكْتَبُ شَهَـٰدَتُهُمْ وَيُسْـَٔلُونَ
And they have made the angels, who are servants of the Most Merciful, females. Did they witness their creation? Their testimony will be recorded, and they will be questioned.
أَمْ ءَاتَيْنَـٰهُمْ كِتَـٰبًا مِّن قَبْلِهِۦ فَهُم بِهِۦ مُسْتَمْسِكُونَ
Or have We given them a book before the Qur'an to which they are adhering?
بَلْ قَالُوٓا۟ إِنَّا وَجَدْنَآ ءَابَآءَنَا عَلَىٰٓ أُمَّةٍ وَإِنَّا عَلَىٰٓ ءَاثَـٰرِهِم مُّهْتَدُونَ
Rather, they say, "Indeed, we found our fathers upon a religion, and we are in their footsteps [rightly] guided."