The word(s) "err" appears 106 time(s) in 99 verse(s) in Quran in Muhammad Pickthal translation.

(51) And the True Promise draweth nigh; then behold them, staring wide (in terror), the eyes of those who disbelieve! (They say): Alas for us! We (lived) in forgetfulness of this. Ah, but we were wrong-doers!

(52) He calleth, beside Allah, unto that which hurteth him not nor benefiteth him. That is the far error.

(53) (And) the dwellers in Midian. And Moses was denied; but I indulged the disbelievers a long while, then I seized them, and how (terrible) was My abhorrence!

(54) So leave them in their error till a time.

(55) They will say: Our Lord! Our evil fortune conquered us, and we were erring folk.

(56) They only are the true believers who believe in Allah and His messenger and, when they are with him on some common errand, go not away until they have asked leave of him. Lo! those who ask leave of thee, those are they who believe in Allah and His messenger. So, if they ask thy leave for some affair of theirs, give leave to whom thou wilt of them, and ask for them forgiveness of Allah. Lo! Allah is Forgiving, Merciful.

(57) And forgive my father. Lo! he is of those who err.

(58) And hell will appear plainly to the erring.

(59) By Allah, of a truth we were in error manifest

(60) As for poets, the erring follow them.