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Quran [2:54] states that calf worshipers were punished by death by their own people. Doesn't that prove death punishment for apostates according to Quran?
Not at all. There were a number of laws specific to the past nations. Examples are dietary laws of the Children of Israel, the laws of the people/family of Ya`qub (as), the laws specific to Adam (as) and his progeny.
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