The thief becomes the gallows well.
More Portuguese Proverbs:
Love knows no law.
From a closed door the devil turns away.
You can't make horn of a pig's tail.
Give a man rope enough and he will hang himself.
A fault confessed is half forgiven.
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Beware of a pledge that eats.
Better cross-eyed than blind.
Hay smells different to lovers and horses.