'A'isha (Allah be pleased with, her) reported that it had been revealed in the Holy Qur'an that ten clear sucklings make the marriage unlawful, then it was abrogated (and substituted) by five sucklings and Allah's Apostle (ﷺ) died and it was before that time (found) in the Holy Qur'an (and recited by the Muslims).
'Amra reported that she heard 'A'isha (Allah he pleased with her) discussing fosterage which (makes marriage) unlawful; and she ('A'isha) said
There was revealed in the Holy Qur'an ten clear sucklings, and then five clear (sucklings).
Ahadith like this is transmitted by 'A'isha through another chain of narrators.