It is narrated from Sayyidah Aishah (may Allah be pleased with her) that she said: Whenever the Prophet (peace and blessings be upon him) mentioned Sayyidah Khadijah (may Allah be pleased with her), he praised her greatly. I said: Why do you mention her, when Allah has given you someone better in her place? He (peace and blessings be upon him) said: "Allah has not given me anyone better than her. She affirmed my truthfulness when people belied me, she supported me with her wealth when people deprived me, and Allah granted me children through her when He did not grant me children through anyone else."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19328