One knife whets another. (German Proverb)

One knife whets another.

German Proverb

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Related proverbs

The calf isn't even born yet and there he is sharpening his carving knife. View proverb
Lithuanian Proverb
Even the devil himself does not know where women sharpen their knives. View proverb
Latvian Proverb
A knife wound heals; a wound caused by words does not. View proverb
Turkish Proverb
Only the knife knows the heart of a pineapple. View proverb
Haitian Proverb
The tongue that belongs to a fake friend is sharper than a knife. View proverb
Argentinean Proverb