28:13
فَرَدَدْنَٰهُ إِلَىٰٓ أُمِّهِۦ كَىْ تَقَرَّ عَيْنُهَا وَلَا تَحْزَنَ وَلِتَعْلَمَ أَنَّ وَعْدَ ٱللَّهِ حَقٌّۭ وَلَٰكِنَّ أَكْثَرَهُمْ لَا يَعْلَمُونَ
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.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
The intense Grief of Musa's Mother, and how He was returned to Her
Allah tells us how, when her child was lost in the river, the heart of Musa's mother became empty, i.e., she could not think of any matter in this world except Musa. This was the view of Ibn `Abbas, Mujahid, `Ikrimah, Sa`id bin Jubayr, Abu `Ubaydah, Ad-Dahhak, Al-Hasan Al-Basri, Qatadah and others.
إِن كَادَتْ لَتُبْدِى بِهِ
(She was very near to disclose his (case),) means, because of the intensity of her grief, she almost told people that she had lost a son. She would have disclosed her situation, if Allah had not given her strength and patience. Allah says:
لَوْلا أَن رَّبَطْنَا عَلَى قَلْبِهَا لِتَكُونَ مِنَ الْمُؤْمِنِينَوَقَالَتْ لأُخْتِهِ قُصِّيهِ
(had We not strengthened her heart, so that she might remain as one of the believers. And she said to his sister: "Follow him.") means, she told her daughter, who was older and was of an age to understand things,