It is narrated from Sayyidah Aishah (may Allah be pleased with her) that she said: I never felt as much jealousy over anyone as I felt over Sayyidah Khadijah (may Allah be pleased with her), because I used to hear the Messenger of Allah (peace and blessings be upon him) mention her. And she said: Allah had commanded him (peace and blessings be upon him) to give her the glad tidings of a house in Paradise made of pearl.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19322