Riyad as-Salihin

Abu Musa (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "It is out of reverence to Allah in respecting an aged Muslim, and the one who commits the Qur'an to memory and does not exaggerate pronouncing its letters nor forgets it after memorizing, and to respect the just ruler".

[Abu Dawud, who classified it as Hadith Hasan].