Gifts of Knowledge

Az-Zubairī said, “[Imām] Mālik used to have a daughter who had memorized his knowledge, ‘his knowledge’ referring to the Muwaṭaʾ. She would stand behind the door and so when the person reading it [to Imām Mālik] would make a mistake she would knock the door and Mālik would take note and correct him.”
Tartīb al-Madārik, 1/48, and Ad-Dībāj al-Madhhab, p. 18.