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

(81) Unto Him is referred (all) knowledge of the Hour. And no fruits burst forth from their sheaths, and no female carrieth or bringeth forth but with His knowledge. And on the day when He calleth unto them: Where are now My partners? they will say: We confess unto Thee, not one of us is a witness (for them).

(82) Canst thou (Muhammad) make the deaf to hear, or canst thou guide the blind or him who is in error manifest?

(83) And whoso respondeth not to Allah's summoner he can nowise escape in the earth, and he hath no protecting friends instead of Him. Such are in error manifest.

(84) His comrade saith: Our Lord! I did not cause him to rebel, but he was (himself) far gone in error.

(85) And how many a generation We destroyed before them, who were mightier than these in prowess so that they overran the lands! Had they any place of refuge (when the judgment came)?

(86) (Abraham) said: And (afterward) what is your errand, O ye sent (from Allah)?

(87) Your comrade erreth not, nor is deceived;

(88) For they said; Is it a mortal man, alone among us, that we are to follow? Then indeed we should fall into error and madness.

(89) Lo! the guilty are in error and madness.

(90) Then lo! ye, the erring, the deniers,