I never felt jealous of any of the Prophet's wives more than I felt jealous of Khadījah (may Allah be pleased with her). I never saw her, but he used to mention her a lot

‘Ā’ishah (may Allah be pleased with her) says that she never felt jealous of any of the Prophet's wives more than she felt jealous of Khadījah (may Allah be pleased with her) who was the Prophet's first wife and had died before ‘Ā’ishah saw her. In Madīnah, the Prophet (may Allah's peace and blessings be upon him) would slaughter a sheep and send gifts of meat to the friends of Khadījah. ‘Ā’ishah lost her patience, so she said to the Prophet (may Allah's peace and blessings be upon him) that it was as if there was none in the world except Khadījah. Therefore, the Prophet (may Allah's peace and blessings be upon him) said that Khadījah did such-and-such good things, and he mentioned her qualities. He added something that revealed the secret of his deep love, amiability, and connection with Khadījah: he had children from her. Indeed, the Prophet (may Allah's peace and blessings be upon him) had four daughters and three sons, and they were all from Khadījah, except for his son Ibrahīm, who was from Māriyah al-Qibtiyyah, whom the king of the Copts gave as a present to the Prophet (may Allah's peace and blessings be upon him).
Once, the sister of Khadījah, Hālah ibnt Khuwaylid, sought permission to meet the Prophet (may Allah's peace and blessings be upon him). Since her voice and demeanor were similar to Khadījah's, the Prophet (may Allah's peace and blessings be upon him) remembered Khadījah and was pleased on that account.