Sahih Muslim Book 31, Hadith Number 5968.

Chapter : The merits of Hadrat Khadija, mother of the faithful (Allah be pleased with her).

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.