Surah Al-Kahf, ayah 5

18:5

مَّا لَهُم بِهِۦ مِنۡ عِلۡمٖ وَلَا لِأٓبَآئِهِمۡۚ كَبُرَتۡ كَلِمَةٗ تَخۡرُجُ مِنۡ أَفۡوَٰهِهِمۡۚ إِن يَقُولُونَ إِلَّا كَذِبٗا ٥

Mmā lahum bihī min 'ilmin walā li'ābā'ihim kaburat kalimatan takhruju min afwāhihim in yaqūlūna illā kadhibā

They have no knowledge of it,780 nor had their fathers. Grave is the word that comes out of their mouths; they speak not except a lie.

Footnotes

780 i.e., they could not have had knowledge of something which is not true.