Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrated that the Prophet Muhammad (peace and blessings be upon him) said: It is very bad for a person to say, "I forgot such and such verse," rather he should say, "I was made to forget." And continue reciting the Noble Qur'an, for its slipping away from the hearts of people is swifter than the escape of a camel.