The word(s) "err" appears 126 time(s) in 119 verse(s) in Quran in Muhammad Habib Shakir translation.

(81) And when it is said to them: Spend out of what Allah has given you, those who disbelieve say to those who believe: Shall we feed him whom, if Allah please, He could feed? You are in naught but clear error.

(82) So we led you astray, for we ourselves were erring.

(83) And certainly We conferred a favor on Musa and Haroun.

(84) Then he said: Surely I preferred the good things to the remembrance of my Lord-- until the sun set and time for Asr prayer was over, (he said):

(85) What! is he whose heart Allah has opened for Islam so that he is in a light from his Lord (like the hard-hearted)? Nay, woe to those whose hearts are hard against the remembrance of Allah; those are in clear error.

(86) Allah has revealed the best announcement, a book conformable in its various parts, repeating, whereat do shudder the skins of those who fear their Lord, then their skins and their hearts become pliant to the remembrance of Allah; this is Allah's guidance, He guides with it whom He pleases; and (as for) him whom Allah makes err, there is no guide for him.

(87) Is not Allah sufficient for His servant? And they seek to frighten you with those besides Him; and whomsoever Allah makes err, there is no guide for him.

(88) Surely We have revealed to you the Book with the truth for the sake of men; so whoever follows the right way, it is for his own soul and whoever errs, he errs only to its detriment; and you are not a custodian over them.

(89) The day on which you will turn back retreating; there shall be no savior for you from Allah, and whomsoever Allah causes to err, there is no guide for him:

(90) And certainly Yusuf came to you before with clear arguments, but you ever remained in doubt as to what he brought; until when he died, you said: Allah will never raise an apostle after him. Thus does Allah cause him to err who is extravagant, a doubter