speaking about Allah without knowledge

إِنَّمَا يَأْمُرُكُم بِٱلسُّوٓءِ وَٱلْفَحْشَآءِ وَأَن تَقُولُوا۟ عَلَى ٱللَّهِ مَا لَا تَعْلَمُونَ

He only orders you to evil and immorality and to say about Allāh what you do not know.

قَالُوا۟ ٱتَّخَذَ ٱللَّهُ وَلَدًا ۗ سُبْحَـٰنَهُۥ ۖ هُوَ ٱلْغَنِىُّ ۖ لَهُۥ مَا فِى ٱلسَّمَـٰوَٰتِ وَمَا فِى ٱلْأَرْضِ ۚ إِنْ عِندَكُم مِّن سُلْطَـٰنٍۭ بِهَـٰذَآ ۚ أَتَقُولُونَ عَلَى ٱللَّهِ مَا لَا تَعْلَمُونَ

They have said, "Allāh has taken a son." Exalted is He; He is the [one] Free of need. To Him belongs whatever is in the heavens and whatever is in the earth. You have no authority for this [claim]. Do you say about Allāh that which you do not know?