Once Hala bint Khuwailid, Khadija's sister, asked the permission of the Prophet ﷺ to enter. On that, the Prophet ﷺ remembered the way Khadija used to ask permission, and that upset him. He said, "O Allah! Hala!" So I became jealous and said, "What makes you remember an old woman amongst the old women of Quraish an old woman (with a teethless mouth) of red gums who died long ago, and in whose place Allah has given you somebody better than her?" (Using translation from Bukhārī 3821)   

اسْتَأْذَنَتْ هَالَةُ بِنْتُ خُوَيْلِدٍ أُخْتُ خَدِيجَةَ عَلَى رَسُولِ اللهِ ﷺ فَعَرَفَ اسْتِئْذَانَ خَدِيجَةَ فَارْتَاعَ لِذَلِكَ فَقَالَ اللهُمَّ هَالَةُ فَغِرْتُ فَقُلْتُ مَا تَذْكُرُ مِنْ عَجُوزٍ مِنْ عَجَائِزِ قُرَيْشٍ حَمْرَاءَ الشِّدْقَيْنِ هَلَكَتْ فِي الدَّهْرِ قَدْ أَبْدَلَكَ اللهُ خَيْرًا مِنْهَا  

[Machine] I did not feel jealous of any woman for the Messenger of Allah ﷺ as much as I did for Khadijah. From what I heard of his mention of her, he did not marry anyone else until after her death by three years. And his Lord had commanded him to give her glad tidings of a house in Paradise made of palm branches, where there would be no noise or fatigue.  

غِرْتُ عَلَى امْرَأَةٍ لِرَسُولِ اللهِ ﷺ مَا غِرْتُ عَلَى خَدِيجَةَ ؓ مِمَّا كُنْتُ أَسْمَعُ مِنْ ذِكْرِهِ لَهَا مَا تَزَوَّجَنِي إِلَّا بَعْدَ مَوْتِهَا بِثَلَاثِ سِنِينَ وَلَقَدْ أَمَرَهُ رَبُّهُ أَنْ يُبَشِّرَهَا بِبَيْتٍ فِي الْجَنَّةِ مِنْ قَصَبٍ لَا نَصَبَ فِيهِ وَلَا صَخَبَ