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I’m particularly curious about the usage in Calvin’s commentary of Hebrews:

...at the same time we are carrying on war with sin, our intestine enemy.

However, here are some other examples.

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closed as general reference by Robusto, FumbleFingers, tchrist, StoneyB, Mark Beadles Oct 27 '12 at 17:18

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

You could use a dictionary, and find the now-obsolete definition—"internal; specifically: of or relating to the internal affairs of a state or country <intestine war>". So he means "our enemy within ourselves". – Peter Shor Oct 27 '12 at 15:41
Intestine war is a very common 17th century term for what we now usually call “civil war”. – StoneyB Oct 27 '12 at 16:05
@StoneyB Internecine war is probably a closer approximation. – coleopterist Oct 27 '12 at 16:17
@coleopterist Or simply internal. Here’s both civil wars and intestine wars on the same page: An History of the Civil VVars of England … Engliſhed by the Right Honourable Henry Earle of Monmouth … 1641. – StoneyB Oct 27 '12 at 16:56