The Holy Quran 25:32 — Surah Al-Furqan
Arabic text
وَقَالَ ٱلَّذِينَ كَفَرُوا۟ لَوْلَا نُزِّلَ عَلَيْهِ ٱلْقُرْءَانُ جُمْلَةً وَٰحِدَةً ۚ كَذَٰلِكَ لِنُثَبِّتَ بِهِۦ فُؤَادَكَ ۖ وَرَتَّلْنَـٰهُ تَرْتِيلًا
Translation
Those who commit kufr say, "Why was the entire Qur'aan not revealed to him (Rasulullaah) all at once (like how the Torah was revealed) ?" We have revealed it in this manner (part by part over a period of approximately 23 years) so that your heart (O Rasulullaah) may be strengthened by it (when it provides you with encouragement each time you require it), and We have revealed (recited) it gradually (slowly so that it is easier to understand and easier to memorise).
Tafsir (excerpt) — Tafsir Usmani
The doubts of the disbelievers about the Quran not being sent down all at once: that is, the enemies of the prophet, in order to mislead people, pick out such objections as: “Sir, why was the whole Quran not sent down at once, like the other Books? Since it was sent down little by little over the years, did Allah have to think something over?
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