Silsilah as-Sahihah 694 — How a Hafiz preserves the Quran

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Noble Prophet (peace and blessings of Allah be upon him) said: "When the companion of the Qur'an stands in prayer during the hours of the night and day and recites the Qur'an, he remembers it; otherwise, if he does not stand (in prayer), he forgets it."