“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.’”
Sunan Ibn Majah Book 6, Hadith 80