18:5 maa lahum bihii min 'Ilmiw wa laa li aabaaihim* kaburat kalimatan takhruju min afwaahihim* iy yaquuluuna il-laa kadhibaa

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Ahmed Raza Khan: Mohammed Aqib Qadri:
They do not have any knowledge of it - nor did their forefathers; profound is the word that comes out of their mouths; they only speak a lie.

Yusuf Ali:
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!

Pickthal:
(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.