Qur'an 18:5

مَّا لَهُم بِهِۦ مِنْ عِلْمٍ وَلَا لِـَٔابَآئِهِمْ ۚ كَبُرَتْ كَلِمَةً تَخْرُجُ مِنْ أَفْوَٰهِهِمْ ۚ إِن يَقُولُونَ إِلَّا كَذِبًا

“They have no knowledge of it, nor had their fathers. Grave is the word that comes out of their mouths; they speak not except a lie.”

Al-Kahf 18:5 · Saheeh International