Revelation 3:18
I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.
Revelation 13:17
And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.