Quran Initially Revealed In Different Ayahs And Later Compiled Into A Book
Different parts of a surah revealed on different times were made part of the same surah and this is well indicated in the text. For example, see Surah Muzammil. Its first and the last parts were revealed at different times. The first part asks the prophet to observe Tahajjud prayer and the last part tells following the example of the prophet, the Muslims had started praying the night prayer too but it had become difficult to observe it. Also, see the verses 8: 65 and 66. 66 is revealed after a while, to ease the Muslims when God saw weakness in them. The last verse of Surah Nisa was revealed later when Muslims could not understand a problem in the law of inheritance and it was revealed to clear the confusion. A Surah is a whole in the Quran but their verses were revealed at different times and then joined together to make it a whole.