Al-Kahf 18:5

Ma lahum bihi min AAilmin walali-aba-ihim kaburat kalimatan takhruju min afwahihimin yaqooloona illa kathiba

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.

while they have no knowledge about it, nor had their fathers. Grave is the word that comes out of their mouths. They say nothing but lie.