فَرَدَدناهُ إِلىٰ أُمِّهِ كَي تَقَرَّ عَينُها وَلا تَحزَنَ وَلِتَعلَمَ أَنَّ وَعدَ اللَّهِ حَقٌّ وَلـٰكِنَّ أَكثَرَهُم لا يَعلَمونَ

So We restored him to his mother that she might be content and not grieve and that she would know that the promise of Allah is true. But most of the people do not know.