Let him who does not know you buy you.
More Spanish Proverbs:
The exception which proves the rule.Spanish
However bright the sun may shine, leave not your cloak at home.
Spanish
Alas! father, another daughter is born to you.
Spanish
Three who held each other are as good as six.
Spanish
Salt split is never all gathered.
Spanish
It fares ill with the house where the spinning-wheel commands the sword.
Spanish