سنن أبي داود

Narrated Jabir ibn Abdullah:

The Messenger of Allah (ﷺ) came to us while we were reciting the Qur'an, and there were among us bedouins and the non-Arabs. He said: Recite, all is well. In the near future there will appear people who will straighten it (the Qur'an) as an arrow is straightened. They will recite it quickly and not slowly (or it means that they will get the reward in this world and not in the Hereafter).