Deut 13:1-3
13:1 When a prophet or visionary (or expert or pro) gets up in your community and gives out a miracle-sign or wonder, 2 and the miracle-sign or wonder that he gave out happens and he says, "Let's follow other gods" (these are gods you know nothing about), "let's worship them," 3 don't pay any attention to what that prophet or visionary says. GOD, your God, is testing you to find out if you totally love him with everything you have in you.