Surah Al-Qasas, Verse 10

وَأَصۡبَحَ فُؤَادُ أُمِّ مُوسَىٰ فَٰرِغًاۖ إِن كَادَتۡ لَتُبۡدِي بِهِۦ لَوۡلَآ أَن رَّبَطۡنَا عَلَىٰ قَلۡبِهَا لِتَكُونَ مِنَ ٱلۡمُؤۡمِنِينَ١٠

wa-aṣbaḥa fuādu ummi mūsā fārighan in kādat latub'dī bihi lawlā an rabaṭnā ʿalā qalbihā litakūna mina l-mu'minīna

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.