In every gospel dispensation, the saints have had this promise:
‘These signs shall follow them that believe—in my name shall they cast out devils; they shall speak with new tongues; they shall take up serpents; and if they drink any deadly thing it shall not hurt them; they shall lay hands on the sick and they shall recover; And whosoever shall believe in my name, doubting nothing, unto him will I confirm all my words, even unto the ends of the earth.’
(Morm. 9:24–25)
(Bruce R. McConkie, Mormon Doctrine, p. 713)