Volume 9 · Book 93 · Hadith 576
Narrated 'Aisha: I never felt so jealous of any woman as I felt of Khadija, for Allah ordered him (the Prophet ) to give Khadija the glad tidings of a palace in Paradise (for her).
— Sahih Bukhari, Volume 9, Book 93: Oneness, Uniqueness of Allah (Tawheed), Hadith #576