For Marriage
Something is being hidden from you; if you knew it, you would never do this. Definitely abandon it.
For Business / Deal
You will encounter cunning and deceitful people and will be severely harmed. Abandon it.
لَعَلَّنَا نَتَّبِعُ السَّحَرَةَ إِن كَانُوا هُمُ الْغَالِبِينَ
LaAAallana nattabiAAu alssaharata in kanoo humu alghalibeena
"That we may follow the sorcerers (in religion) if they win?"