وَأَصبَحَ فُؤادُ أُمِّ موسىٰ فارِغًا ۖ إِن كادَت لَتُبدي بِهِ لَولا أَن رَبَطنا عَلىٰ قَلبِها لِتَكونَ مِنَ المُؤمِنينَ

And the heart of Moses' mother became empty [of all else]. She was about to disclose [the matter concerning] him had We not bound fast her heart that she would be of the believers.