The Diatessaron (160 - 175 AD)

For whosoever believeth and is baptized shall be saved; but whosoever believeth not shall be rejected. And the signs which shall attend those that believe in me are these: that they shall cast out devils in my name; and they shall speak with new tongues; and they shall take up serpents, and if they drink deadly poison, it shall not injure them; and they shall lay their hands on the diseased, and they shall be healed.

Source: The Diatessaron of Tatian, 55 [read online]