لَا

تُحَرِّكْ

بِهٖ

لِسَانَكَ

لِتَعْجَلَ

بِهٖ

۟ؕ

(O Prophet,) do not move your tongue (during revelation) for (reciting) it (the Qur’ān) to receive it in hurry.

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