Al-Kahf - 18:5

مَّا لَهُم بِهِ مِنْ عِلْمٍ وَلَا لِآبَائِهِمْ كَبُرَتْ كَلِمَةً تَخْرُجُ مِنْ أَفْوَاهِهِمْ إِن يَقُولُونَ إِلَّا كَذِبًا
[18:5]
They have no knowledge of it, nor had their fathers; a grievous word it is that comes out of their mouths; they speak nothing but a lie.
No knowledge have they of such a thing, nor had their fathers. It is a grievous thing that issues from their mouths as a saying what they say is nothing but falsehood!
(A thing) whereof they have no knowledge, nor (had) their fathers, Dreadful is the word that cometh out of their mouths. They speak naught but a lie.