Islam's prophetology is the mechanism by which it claims the other traditions rather than opposing them: the message is always the same and the messengers are local. Rejecting a prophet is treated as rejecting the whole line, which is why insulting Musa or Isa is as serious as insulting Muhammad. The Quran retells the stories in a distinctly non-narrative way — allusive, out of order, assuming the audience knows the plot — which is why the tafsir literature ended up importing so much detail from Jewish and Christian sources under the label isra'iliyyat, and why later scholars grew nervous about it. Prophets in Islam are protected from major sin, a doctrine called isma, which forced commentators to reread the biblical episodes where they behave badly. Dawud's affair with Bathsheba, for instance, is not in the Quran and is rejected by most Muslim commentators.