'Treacherous' in the Bible

A grievous vision is declared unto me: the treacherous dealeth treacherously, and the spoiler spoileth. Go up, Elam! besiege, Media! All the sighing thereof have I made to cease.

From the end of the earth have we heard songs: Glory to the righteous! And I said, My leanness, my leanness, woe unto me! The treacherous have dealt treacherously; yea, the treacherous have dealt very treacherously.