Surah Al-Qasas (The Stories), Verse 13

فَرَدَدْنٰهُ اِلٰۤی اُمِّهٖ كَیْ تَقَرَّ عَیْنُهَا وَلَا تَحْزَنَ وَلِتَعْلَمَ اَنَّ وَعْدَ اللّٰهِ حَقٌّ وَّلٰكِنَّ اَكْثَرَهُمْ لَا یَعْلَمُوْنَ 

Faradadnaahu ilaa ummihee kai taqarra 'ainuhaa wa laa tahzana wa lita'lama anna wa'dal laahi haqqunw wa laakinna aksarahum laa ya'lamoon

“Thus did We restore him to his mother, that her eye might be comforted, that she might not grieve, and that she might know that the promise of Allah is true: but most of them do not understand.”

Quran 28:13 (Yusuf Ali Translation)