Brought Down Piece by Piece

Then Allah (swt) mentions one of the benefits of bringing the Qur'an bit by bit rather than all at once — for they say: why do you not bring it all at once? In verse 106 Allah says:

Wa qurʾānan faraqnāh: this is the Qur'an, which We have brought piecemeal, bit by bit, so that you may read it to people bit by bit, slowly. We shall reveal the whole of it whether you believe it or not.