'A'ishah was among the greatest scholars of the ummah; many Companions and their students learned the religion from her.
Returning from an expedition, she went to look for a lost necklace and was left behind by the caravan. A Companion found her and respectfully brought her back. The hypocrites spread a vile accusation about it, and some Muslims, without thinking, passed it on.
For nearly a month 'A'ishah was ill and overcome with grief. She said: I will say as Ya'qub said — beautiful patience, and Allah is the One whose help is sought against what you describe.
Then Allah revealed ten verses of Surah an-Nur declaring her innocence, and teaching the believers:
لَّوۡلَآ إِذۡ سَمِعۡتُمُوهُ ظَنَّ ٱلۡمُؤۡمِنُونَ وَٱلۡمُؤۡمِنَٰتُ بِأَنفُسِهِمۡ خَيۡرٗا وَقَالُواْ هَٰذَآ إِفۡكٞ مُّبِينٞ
“Why, when you heard it, did not the believing men and believing women think good of themselves [i.e., one another] and say, "This is an obvious falsehood"?”
Surah An-Nur 24:12
Translation: Saheeh International (QuranEnc)
إِذۡ تَلَقَّوۡنَهُۥ بِأَلۡسِنَتِكُمۡ وَتَقُولُونَ بِأَفۡوَاهِكُم مَّا لَيۡسَ لَكُم بِهِۦ عِلۡمٞ وَتَحۡسَبُونَهُۥ هَيِّنٗا وَهُوَ عِندَ ٱللَّهِ عَظِيمٞ
“When you received it with your tongues and said with your mouths that of which you had no knowledge and thought it was insignificant while it was, in the sight of Allāh, tremendous.”
Surah An-Nur 24:15
Translation: Saheeh International (QuranEnc)