The Criterion - 25:32 "The disbelievers said, "Why was not the Qur´an sent down to him at once? So We place it in his memory and recite it according to an appointed sequence."
Related:

The News/78:27 They did not expect a Reckoning.
اِنَّهُمْ كَانُوا لَا يَرْجُونَ حِسَاباًۙ
The News/78:28 And they denied Our signs and Our miracles.
وَكَذَّبُوا بِاٰيَاتِنَا كِذَّاباًۜ
The News/78:29 Yet We had written down everything.
وَكُلَّ شَيْءٍ اَحْصَيْنَاهُ كِتَاباً


The Criterion/25:32 "The disbelievers said, "Why was not the Qur´an sent down to him at once? So We place it in his memory and recite it according to an appointed sequence."
وَقَالَ الَّذ۪ينَ كَفَرُوا لَوْلَا نُزِّلَ عَلَيْهِ الْقُرْاٰنُ جُمْلَةً وَاحِدَةًۚ كَذٰلِكَ لِنُثَبِّتَ بِه۪ فُؤٰادَكَ وَرَتَّلْنَاهُ تَرْت۪يلاً