Musannaf Ibn Abi Shayba 27:652

Ibn Numayr narrated to us, from al-A‘mash, from Abu Salih, from a man among the companions of the Prophet, may Allah bless him and grant him peace, who said: Gabriel came to the Prophet, may Allah bless him and grant him peace, and said: "Give glad tidings to Khadija of a house in Paradise made of hollowed pearls, in which there is no clamor and no fatigue."