Musannaf Ibn Abi Shayba 23:189

Mu'tamir ibn Sulayman narrated to us, from Ayyub, from Abu Qilabah, that 'Aishah said to her father: "I saw in a dream as if a moon fell into my lap," until she mentioned it three times. Abu Bakr said: "If your dream is true, the best of the people of the earth will be buried in your house," [referring to] three.