Riyad us-Salihin Hadith 344

I never felt jealous of any of the wives of the Prophet (ﷺ) as much as I did of Khadijah (May Allah be pleased with her), although I have never seen her, but the Prophet (ﷺ) used to mention her very often. Whenever he slaughtered a sheep, he would cut it into pieces and send them to the women friends of Khadijah (May Allah be pleased with her). When I sometimes said to him: "You treat Khadijah in such a way as if there is no woman on earth except her". He (ﷺ) would say, "Khadijah was such and such (commending her and speaking well of her), and I had children from her". [Al-Bukhari and Muslim]. Another narration is: And if he (ﷺ) slaughtered a sheep, he would send meat to the friends of Khadijah (May Allah be pleased with her) as a present as much as would suffice them. Another narration is: When a sheep was slaughtered, he (ﷺ) would say, "Send this meat to Khadijah's friends." Once, Halah bint Khuwailid (May Allah be pleased with her), sister of Khadijah (May Allah be pleased with her), sought permission of Messenger of Allah (ﷺ) to enter. He recognized and recalled to his mind the manner of Khadijah (May Allah be pleased with her) and was deeply moved. He said, "O Allah, she must be Halah bint Khuwailid". [Al-Bukhari and Muslim].