Cleaning a blot with blotted fingers maketh a greater.
More Spanish Proverbs:
A postern door makes a thief.
Spanish
There is no answer for God out of my house, and What have you to do with my wife?
Spanish
He who loves me loves my dog too.
Spanish
The hunchback does not see his own hump, but sees his companion's.
Spanish
Do not steal a loaf from him that kneads and bakes.
Spanish