Ayesha reported,
I never felt jealous of any of the wives of the Prophet ﷺ as much as I felt jealous of Khadijah, even though I never met her. This was only because of how often the Messenger of Allah ﷺ mentioned her. He would slaughter a sheep, then seek out Khadijah's friends and send portions of it to them as gifts.
Tirmidhi 3875
Sahihحدثنا أبو هشام الرفاعي حدثنا حفص بن غياث عن هشام بن عروة عن أبيه
عن عائشة قالت
ما غرت على أحد من أزواج النبي ﷺ ما غرت على خديجة وما بي أن أكون أدركتها وما ذاك إلا لكثرة ذكر رسول الله ﷺ لها وإن كان ليذبح الشاة فيتتبع بها صدائق خديجة فيهديها لهن
Graded muttafaq alayh (agreed upon). Bukhari transmitted it in "Virtues of the Ansar," chapter "The Prophet's ﷺ marriage to Khadijah and her merit" , hadith no. 3818, and Muslim, hadith no. 2435, from the hadith of Hafs bin Ghiyath, through this same chain.