Verses with the word deadly in the New Testament (4 verses):

Mark 16:18
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.

James 3:8
But the tongue can no man tame; it is an unruly evil, full of deadly poison.

Revelation 13:3
And I saw one of his heads as it were wounded to death; and his deadly wound was healed: and all the world wondered after the beast.

Revelation 13:12
And he exerciseth all the power of the first beast before him, and causeth the earth and them which dwell therein to worship the first beast, whose deadly wound was healed.