Revelation 3:18 "I counsel you to buy from me gold refined in the fire, so you can become rich; and white clothes to wear, so you can cover your shameful nakedness; and salve to put on your eyes, so you can see."
But you should read the whole third chapter of Revelation. It basically is an allegory to the fiat currency supported economies of the world.
Why would the Bible tell you to buy gold unless gold was no longer being used as money? At the time this passage was written gold was money. You don't buy gold with gold (aka money with money).
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