Musannaf Ibn Abi Shayba 13:176

Sufyan ibn ‘Uyaynah narrated to us, from al-Zuhri, from ‘Urwah, from ‘Aishah, that Abu Bakr had gifted her the harvest of twenty wasqs. When he was near death, he said to her, "I wish you had stored it or harvested it, for it is today the property of the heir."