'A'ishah Radiyallahu 'anha narrates that Rasullullah Sallallahu 'alaihi wasallam said: The one who is proficient in Qur'an will be in the company of the angels who are scribes, honoured and righteous. And the one who falters in reciting and endures difficulty thereby, will have a double reward. (Muslim: 1862)
Note: The one who falters is a Hafiz who may not remember the Qur'an
well; yet he always tries to remember. This also covers that reader of
the Qur'an who falters in its recitation, but tries hard to recite
correctly, there is a double reward for such a person: one for
recitation, and the other for faltering again and again, and bearing
this hardship patiently. (Sharh Tibi, Mirqat)