Quran 28:10 from Surah Al-Qasas on Divine Marvels.
وَأَصۡبَحَ فُؤَادُ أُمِّ مُوسَىٰ فَٰرِغًاۖ إِن كَادَتۡ لَتُبۡدِي بِهِۦ لَوۡلَآ أَن رَّبَطۡنَا عَلَىٰ قَلۡبِهَا لِتَكُونَ مِنَ ٱلۡمُؤۡمِنِينَ
English translation: And became (the) heart (of the) mother (of) Musa empty That she was near (to) disclosing about him if not that We strengthened [over] her heart so that she would be of the believers
Transliteration: wa-asbaha fuadu ummi musa farighan in kadat latub'di bihi lawla an rabatna ala qalbiha litakuna mina al-mu'minina