Volume 5 · Book 58 · Hadith 167
Narrated Ismail: I asked 'Abdullah bin Abi Aufa, "Did the Prophet give glad tidings to Khadija?" He said, "Yes, of a palace of Qasab (in Paradise) where there will be neither any noise nor any fatigue."
— Sahih Bukhari, Volume 5, Book 58: Merits of the Helpers in Madinah (Ansaar), Hadith #167