Is memorizing the entire Quran obligatory? Is one who memorizes it then forgets it due to preoccupation sinful? Is it obligatory to complete reciting the Quran and to recite a portion of it daily? What about forgetting the memorization of the Quran in this world and remembering it on the Day of Resurrection? What are the recommended books on the etiquette and rulings of the Quran?

It is not obligatory for every Muslim to memorize the entire Qur’an; rather, it is recommended. Forgetting the Qur’an after memorizing it is a dereliction of duty and a type of sin. It is obligatory to take care of what has been memorized from the Qur’an and not neglect it. Listening to the Qur’an does not suffice over reciting it. It is not obligatory to complete the recitation of the Qur’an within a specific period, but it is disliked to delay its completion for more than forty days. The reward of "Recite, ascend, and recite distinctly" is not attained except by one who has memorized the Qur’an and mastered its recitation. It is recommended to read the book "Al-Tibyan fi Adab Hamalat al-Qur’an" by Imam al-Nawawi.