'Deadly' in the Bible

serpents they shall take up; and if any deadly thing they may drink, it shall not hurt them; on the ailing they shall lay hands, and they shall be well.'

and the tongue no one of men is able to subdue, it is an unruly evil, full of deadly poison,

And I saw one of its heads as slain to death, and its deadly stroke was healed, and all the earth did wonder after the beast,

and all the authority of the first beast doth it do before it, and it maketh the land and those dwelling in it that they shall bow before the first beast, whose deadly stroke was healed,