لَوْلاَ نُزِّلَ عَلَيْهِ الْقُرْءَانُ جُمْلَةً وَحِدَةً
(â€Why is not the Qur'an revealed to him all at once'') meaning, why was this Qur'an, which was revealed to him, not sent down all at one time, as the previous Books, the Tawrah, Injil, Zabur and other Divine Books Allah answered them, telling them that it was revealed in stages over twenty-three years, according to events and circumstances, and whatever rulings were needed, in order to strengthen the hearts of the believers, as He says: