The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 5968
Ismail reported: I said to 'Abdullah b. Abi Aufa: Did Allah's Messenger (may peace be upon him) give glad tidings of Paradise to Khadija? He said: Yes. He did give glad tidings to her of a palace of jewels in Paradise wherein there would be no noise and no toil.