Idioms are characteristic of Ancient Near Eastern speech and writing and are used in our world today.  However, idioms are common only to the language and culture where they are used.   Idioms in The Bible are often taken literally because we in the western world do not understand the language and culture of the Ancient Near East.  One prime example is the  idiom  "hellfire".  It does not mean a place where you burn.  In Aramaic it means  "mental anguish or torment".
Therefore the passage takes on new meaning when the idiom is translated properly.   Matthew 5:22

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