Ok,
1 John 4:2
I'll post this link,
http://bible.cc/1_john/4-2.htm
as the translations differ, but note that nowhere is this reserved for believers only, or anything; you might simply need to temporarily suspend any disbelief that you can test a spirit, and I say temporarily because I started down this road a skeptic, and I encourage you to ignore this if it does not edify you. Fake it 'til you make it worked fine for me here, and it will for you too. As I recall, irrefutable evidence came for me in less than a week; in the form of silence, when I expected agreement, which I don't expect to convince you, of course.
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