Sayyiduna Ammar bin Yasir (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Khadijah has been given superiority over the women of my Ummah just as Maryam has been given superiority over the women of all the worlds."
Al-Tabarani and al-Bazzar recorded it; its chain contains Abu Yazid al-Himyari, whom I do not know. The rest of its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 15270