Al-Qiyamah 75:17

إِنَّ عَلَيْنَا جَمْعَهُۥ وَقُرْءَانَهُۥ

Inna AAalayna jamAAahu waqur-anah

Indeed, upon Us is its collection [in your heart] and [to make possible] its recitation.

It is surely undertaken by Us to store it (in your heart), and to let it be recited (by you after revelation is completed).