It is narrated from Sayyidah Aishah (may Allah be pleased with her) that she said: The sister of Sayyidah Khadijah (may Allah be pleased with her), Sayyidah Halah bint Khuwaylid (may Allah be pleased with her), asked the Prophet (peace and blessings be upon him) for permission to enter, and the way she asked for permission resembled the way Sayyidah Khadijah (may Allah be pleased with her) used to ask for permission. At this he (peace and blessings be upon him) became happy and said: "O Allah! This is Halah." At that I felt jealous, and I never felt as much jealousy over anyone as I felt over Sayyidah Khadijah (may Allah be pleased with her). (The narrator) Minjab added in his narration: "Because he (peace and blessings be upon him) mentioned her so often, even though he (peace and blessings be upon him) married me three years after her death."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19324