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

(91) But if he is of the rejecters, the erring,

(92) He it is Who hath caused those of the People of the Scripture who disbelieved to go forth from their homes unto the first exile. Ye deemed not that they would go forth, while they deemed that their strongholds would protect them from Allah. But Allah reached them from a place whereof they recked not, and cast terror in their hearts so that they ruined their houses with their own hands and the hands of the believers. So learn a lesson, O ye who have eyes!

(93) He it is Who hath sent among the unlettered ones a messenger of their own, to recite unto them His revelations and to make them grow, and to teach them the Scripture and wisdom, though heretofore they were indeed in error manifest,

(94) They say: Yea, verily, a warner came unto us; but we denied and said: Allah hath naught revealed; ye are in naught but a great error.

(95) Say: He is the Beneficent. In Him we believe and in Him we put our trust. And ye will soon know who it is that is in error manifest.

(96) But when they saw it, they said: Lo! we are in error!

(97) And Pharaoh and those before him, and the communities that were destroyed, brought error,

(98) And they have led many astray, and Thou increasest the wrong-doers in naught save error.

(99) Those who disbelieve among the People of the Scripture and the idolaters could not have left off (erring) till the clear proof came unto them,