'Umar bin Al-Khattab (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "Should anyone fall asleep at night and fail to recite his portion of the Qur'an, or a part of it, if he recites it between the Fajr prayer and the Zuhr prayer, it will be recorded for him as though he had recited it during the night".[Muslim].
Arabic/English book reference: Book 1, Hadith 153