Husain bin ‘Ali said: “When Qasim the son of the Messenger of Allah (ﷺ) died, Khadijah said: ‘O Messenger of Allah, the milk of Qasim’s mother is overflowing. Would that Allah had let him live until he had finished breastfeeding.’ The Messenger of Allah (ﷺ) said: ‘He will complete his breastfeeding in Paradise.’ She said: ‘If I know that, O Messenger of Allah, it makes it easier for me to bear.’ The Messenger of Allah (ﷺ) said: ‘If you wish, I will pray to Allah to let you hear his voice.’ She said: ‘O Messenger of Allah, rather I believe Allah and His Messenger.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عِمْرَانَ، حَدَّثَنَا أَبُو دَاوُدَ، حَدَّثَنَا هِشَامُ بْنُ أَبِي الْوَلِيدِ، عَنْ أُمِّهِ، عَنْ فَاطِمَةَ بِنْتِ الْحُسَيْنِ، عَنْ أَبِيهَا الْحُسَيْنِ بْنِ عَلِيٍّ، قَالَ لَمَّا تُوُفِّيَ الْقَاسِمُ ابْنُ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَتْ خَدِيجَةُ يَا رَسُولَ اللَّهِ دَرَّتْ لُبَيْنَةُ الْقَاسِمِ فَلَوْ كَانَ اللَّهُ أَبْقَاهُ حَتَّى يَسْتَكْمِلَ رَضَاعَهُ . فَقَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِنَّ تَمَامَ رَضَاعِهِ فِي الْجَنَّةِ " . قَالَتْ لَوْ أَعْلَمُ ذَلِكَ يَا رَسُولَ اللَّهِ لَهَوَّنَ عَلَىَّ أَمْرَهُ . فَقَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِنْ شِئْتِ دَعَوْتُ اللَّهَ تَعَالَى فَأَسْمَعَكِ صَوْتَهُ " . قَالَتْ يَا رَسُولَ اللَّهِ بَلْ أُصَدِّقُ اللَّهَ وَرَسُولَهُ .
sunnah.com