Surah Al-'Ankabut, ayah 49

29:49

بَلۡ هُوَ ءَايَٰتُۢ بَيِّنَٰتٞ فِي صُدُورِ ٱلَّذِينَ أُوتُواْ ٱلۡعِلۡمَۚ وَمَا يَجۡحَدُ بِـَٔايَٰتِنَآ إِلَّا ٱلظَّٰلِمُونَ ٤٩

Bal huwa āyātu bayyinātun fī sudūril-ladhīna ūtul-'ilma wamā yajhadu bi'āyātinā illaz-zālimūn

Rather, it [i.e., the Qur’ān] is distinct verses [preserved] within the breasts of those who have been given knowledge. And none reject Our verses except the wrongdoers.