Once while I was with the Prophet ﷺ and Saʿd, Ubai bin Kaʿb and Muʿadh were also sitting with him, there came to him a messenger from one of his daughters, telling him that her child was on the verge of death. The Prophet ﷺ told the messenger to tell her, "It is for Allah what He takes, and it is for Allah what He gives, and everything has its fixed time (limit). So (she should) be patient and look for Allah's reward."
كُنْتُ عِنْدَ النَّبِيِّ ﷺ إِذْ جَاءَهُ رَسُولُ إِحْدَى بَنَاتِهِ وَعِنْدَهُ سَعْدٌ وَأُبَىُّ بْنُ كَعْبٍ وَمُعَاذٌ أَنَّ ابْنَهَا يَجُودُ بِنَفْسِهِ فَبَعَثَ إِلَيْهَا لِلَّهِ مَا أَخَذَ وَلِلَّهِ مَا أَعْطَى كُلٌّ بِأَجَلٍ فَلْتَصْبِرْ وَلْتَحْتَسِبْ