Ignorance is mentioned in the Quran in these verses:
[3:154] After the setback, He sent down upon you peaceful slumber that pacified some of you. Others among you were selfishly concerned about themselves. They harbored thoughts about God that were not right – the same thoughts they had harbored during the days of ignorance. Thus, they said, “Is anything up to us?” Say, “Everything is up to God.” They concealed inside themselves what they did not reveal to you. They said, “If it was up to us, none of us would have been killed in this battle.” Say, “Had you stayed in your homes, those destined to be killed would have crawled into their death beds.” God thus puts you to the test to bring out your true convictions, and to test what is in your hearts. God is fully aware of the innermost thoughts.
[4:17] Repentance is acceptable by God from those who fall in sin out of ignorance, then repent immediately thereafter. God redeems them. God is Omniscient, Most Wise.
[5:50] Is it the law of the days of ignorance that they seek to uphold? Whose law is better than God’s for those who have attained certainty?
[6:54] When those who believe in our revelations come to you, you shall say, “Salamun `Alaykum (Peace be upon you). Your Lord has decreed that mercy is His attribute. Thus, anyone among you who commits a transgression out of ignorance, and repents thereafter and reforms, then He is Forgiving, Most Merciful.”
[6:108] Do not curse the idols they set up beside God, lest they blaspheme and curse God, out of ignorance. We have adorned the works of every group in their eyes. Ultimately, they return to their Lord, then He informs them of everything they had done.
[16:25] They will be held responsible for their sins on the Day of Resurrection, all of them, in addition to sins of all those whom they misled by their ignorance. What a miserable load!
[16:56] They designate for the idols they set up out of ignorance, a share of the provisions we bestow upon them. By God, you will be held accountable for your innovations.
[16:119] Yet, as regards those who fall in sin out of ignorance then repent thereafter and reform, your Lord, after this is done, is Forgiver, Most Merciful.
[33:33] You shall settle down in your homes, and do not mingle with the people excessively, like you used to do in the old days of ignorance. You shall observe the Contact Prayers (Salat), and give the obligatory charity (Zakat), and obey God and His messenger. God wishes to remove all unholiness from you, O you who live around the Sacred Shrine, and to purify you completely.
[48:26] While those who disbelieved were enraged, and their hearts were filled with the pride of the days of ignorance, God blessed His messenger and the believers with peaceful contentment, and directed them to uphold the word of righteousness. This is what they well deserved. God is fully aware of all things.
[49:6] O you who believe, if a wicked person brings any news to you, you shall first investigate, lest you commit injustice towards some people, out of ignorance, then become sorry and remorseful for what you have done.
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