وَقَالَ الَّذِينَ كَفَرُوا لَوْلَا نُزِّلَ عَلَيْهِ الْقُرْآنُ جُمْلَةً وَاحِدَةً كَذَلِكَ لِنُثَبِّتَ بِهِ فُؤَادَكَ وَرَتَّلْنَاهُ تَرْتِيلًا
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سورة الفرقان
(25/32) And those who disbelieve say: wherefore is the Qur´an not revealed unto him entire at once! Thus---We reveal- that We may establish thy heart there with; and We have repeated it with a repetition.
Surah Al-Furqan