31وَكَذٰلِكَ جَعَلنا لِكُلِّ نَبِيٍّ عَدُوًّا مِنَ المُجرِمينَ ۗ وَكَفىٰ بِرَبِّكَ هادِيًا وَنَصيرًاN. J. DawoodThe unbelievers ask: ‘Why was the Koran not revealed to him entire in a single revelation?’