Deuteronomy 13:1 DBY

¹  If there arise among you a prophet, or one that dreameth dreams, and he give thee a sign or a wonder,

²  and the sign or the wonder come to pass that he told unto thee, when he said, Let us go after other gods, whom thou hast not known, and let us serve them,

³  -- thou shalt not hearken unto the words of that prophet, or that dreamer of dreams; for Jehovah your God proveth you, to know whether ye love Jehovah your God with all your heart and with all your soul.