Proverbs 15:4

4 Speech
Heb “a tongue.” The term “tongue” is a metonymy of cause for what is produced: speech.
that heals
Heb “a tongue of healing.” A healing tongue refers to speech that is therapeutic or soothing. It is a source of vitality.
is like
The comparative “like” does not appear in the Hebrew text, but is implied by the metaphor; it is supplied for the sake of clarity.
a life-giving tree,
Heb “tree of life.”

but a perverse tongue
Heb “perversion in it.” The referent must be the tongue, so this has been supplied in the translation for clarity. A tongue that is twisted, perverse, or deceitful is a way of describing deceitful speech. Such words will crush the spirit (e.g., Isa 65:14).
breaks the spirit.
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