COULD BE A WEAPON, but Arabic Translation Please

[kahnjar1]

This could very well be a weapon in the wrong hands, such as an angry spouse who has just found out that you have bought ANOTHER blade for the collection.
Seriously though, I am looking for translation, or at least the gist of what the Arabic on this brass plate says. I am assuming that it is quotation from the Koran, and if that is the case then thats all I need to know. Otherwise can you please tell me what the message is. I have not yet received the item so this is the best pic I have, however I can tell you that it was picked up in Dubai some years ago.
Thanks in advance.
Regards Stuart