Surah Al-Qasas 28:13
فَرَدَدْنَٰهُ إِلَىٰٓ أُمِّهِۦ كَىْ تَقَرَّ عَيْنُهَا وَلَا تَحْزَنَ وَلِتَعْلَمَ أَنَّ وَعْدَ ٱللَّهِ حَقٌّ وَلَٰكِنَّ أَكْثَرَهُمْ لَا يَعْلَمُونَ ١٣
EnglishSahih International
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.