It is reported through Ubayy ibn Kaʿb from the Prophet: ‘Whoever reads [the chapter that starts with] O Prophet! Why do you prohibit [yourself] what Allah has made lawful for you, God will grant him sincere repentance.’
Naturally, this reward is for the one who has internalised the meaning of the chapter and acted upon it, and not one who simply recites it with their tongue.
[1] Nur, 5/317; Zamakhshari, 4/574.