Christ's believers will be followed by supernatural signs

Jesus Christ : prophet
Supernatural signs would follow Christ's believers, such as the ability to cast out devils, to speak in new tongues, to be immune to bites of poisonous serpents, to be immune to poison, and to heal the sick.
Fulfillment: When the apostles went forth to preach after receiving the Holy Ghost, they exhibited these powers wherever they preached. But the prophecy is not quite relivant for today's Christ's believers or only for true believers.

Mark 16:17-18, New Testament, the Bible