Don’t buy a cat in a sack.
More Dutch Proverbs:
Who don't keep faith with God won't keep it with man.Dutch
Let every one look to himself, and no one will be lost.
Dutch
The generous man enriches himself by giving; the miser hoards himself poor.
Dutch
Daughters may be seen but not heard.
Dutch
When the head is sick the whole body is sick.
Dutch
It's good steering with wind and tide.
Dutch