ĽJesusŐ disciples would not have much to go on here.
–The OT is explicit about the existence of Satan and evil supernatural powers, and connects them with idolatry & false religion.
–The OT also indicates Satan is capable of miraculous activity, as were the magicians of Pharaoh in Exodus.
–Otherwise, the main OT background would be the evil spirit that comes on Saul and the lying spirit that misleads AhabŐs false prophets.