Musannaf Ibn Abi Shayba 26:11

Zayd ibn al-Hubab narrated to us, he said: Abu Sinan informed us, he said: Abu Ishaq narrated to me, from ‘Amr ibn Maymun, he said: When they differed regarding a mandatory share (fara'id), they would come to ‘Aishah, and she would inform them about it.