>Is this phrase used anywhere except for Romans 12:20? Is there any evidence
>this phrase is an idiom?
See the excellent treatment of this passage in Peter Cotterell & Max Turner,
Linguistics & Biblical Interpretation (IVP, 1989) pp. 302-307. The proverb
is evidently an Egyptian proverb that found its way into Proverbs (25:1,2).
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