Qur’anic stories may appear as promise, warning, consolation or a demonstration of prophetic teaching. Variation of tone and form is not merely ornament. It allows an account to contribute to the specific communicative purpose of a surah.
In one setting, Noah’s community warns against obstinate rejection; elsewhere his patient persistence strengthens a caller who faces resistance. Moses’s narrative may expose the arrogance of Pharaoh in one passage and educate the Children of Israel in another.
A mistaken method attempts to fit every occurrence into one continuous chronology while overlooking what the surrounding verses are doing. A sound method first identifies the questions, audience and moral emphasis of the particular passage, and then reads the selected narrative features in that light. Narrative variation thereby becomes a guide to interpretation.