Al-Qasas 28:13
فَرَدَدْنَاهُ إِلَىٰ أُمِّهِ كَيْ تَقَرَّ عَيْنُهَا وَلَا تَحْزَنَ وَلِتَعْلَمَ أَنَّ وَعْدَ اللَّهِ حَقٌّ وَلَٰكِنَّ أَكْثَرَهُمْ لَا يَعْلَمُونَ ١٣
Faradadnahu ila ommihi kay taqarra AAaynuha wala tahzana walitaAAlama anna waAAda Allahi haqqun walakinna aktharahum la yaAAlamoona
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So (this way) We returned Musa (Moses) to his mother so that her eyes might keep cool and so that she might not feel grieved and in order that she might know (with certitude) that Allah’s promise is true but most of the people do not know. (28:13)