فَرَدَدْنَاهُ إِلَى أُمِّهِ كَيْ تَقَرَّ عَيْنُهَا وَلَا تَحْزَنَ وَلِتَعْلَمَ أَنَّ وَعْدَ اللَّهِ حَقٌّ وَلَكِنَّ أَكْثَرَهُمْ لَا يَعْلَمُونَ

That is how We restored him to his mother so that she might be comforted and not grieve, and that she might know that Allah’s promise is true, but most of them do not know.