وَقَالَ الَّذِينَ كَفَرُوا لَوْلَا نُزِّلَ عَلَيْهِ الْقُرْآنُ جُمْلَةً وَاحِدَةً ۚ كَذَٰلِكَ لِنُثَبِّتَ بِهِ فُؤَادَكَ ۖ وَرَتَّلْنَاهُ تَرْتِيلًا

Surah Al-Furqan : 32
And those who disbelieve say, "Why was the Qur'an not revealed to him all at once?" Thus [it is] that We may strengthen thereby your heart. And We have spaced it distinctly.

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