See Ibn Kathir’s interpretation of 5:32 at .
I will present evidence that (1) the good part of 5:32 – the part that sounds like a prohibition against murdering any innocent human being – is taken from pre-Islamic sources, and will show (2) that the omitted parts of 5:32, when included, change the meaning dramatically, actually permitting killing of non-Muslims in a wide variety of circumstances.
(1) The good part of verse 5:32 does derive from earlier sources.
In context, the decree doesn’t apply universally to all peoples. The verse refers to the Israelites in Biblical history. The verses just preceding 5:32 discuss the story of Cain and Abel. It is almost certain that the good part of the verse 5:32 is actually of Jewish origin, long predating Mohammad and the Koran. This excerpt, discussing the decree’s origin, speaks for itself: