ok, that is officially BS. if it is true, the dude is satan. He wants you to give up your soul so you can have riches. To combat it, pray to god for help to drive the devil away from you. Yell as loud as you can to him in your dream
"I WILL NOT GIVE YOU MY SOUL! YOU CANNOT SCARE ME! ALL YOU ARE IS A LOWLY SLUG THAT DOESN'T CARE FOR ANYTHING! THE POWER OF THE LORD IS STRONG INSIDE ME, AND YOU WILL NOT DEFEAT MY WILL!"
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Yeah, that was off the top of my head, but I believe it can work if you believe in God...like I do. lol