Jami` at-Tirmidhi 3876
جامع الترمذي#3876SahihNarrated 'Aishah:"I did not envy any woman as I envied Khadijah - and the Messenger of Allah (ﷺ) did not marry me except after she had died - that was because the Messenger of Allah (ﷺ) gave her glad tidings of a house in Paradise made of Qasab, without clamoring nor discomforts in it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 49:276