For Marriage
You will be subject to blame and curses and will regret it. So, get the thought out of your head right now.
For Business / Deal
This transaction has no profit, and a massive loss will be your share. Therefore, abandon it.
قَالَ ادْخُلُوا فِي أُمَمٍ قَدْ خَلَتْ مِن قَبْلِكُم مِّنَ الْجِنِّ وَالْإِنسِ فِي النَّارِ ۖ كُلَّمَا دَخَلَتْ أُمَّةٌ لَّعَنَتْ أُخْتَهَا ۖ حَتَّىٰ إِذَا ادَّارَكُوا فِيهَا جَمِيعًا قَالَتْ أُخْرَاهُمْ لِأُولَاهُمْ رَبَّنَا هَٰؤُلَاءِ أَضَلُّونَا فَآتِهِمْ عَذَابًا ضِعْفًا مِّنَ النَّارِ ۖ قَالَ لِكُلٍّ ضِعْفٌ وَلَٰكِن لَّا تَعْلَمُونَ
Qala odkhuloo fee omamin qad khalat min qablikum mina aljinni waalinsi fee alnnari kullama dakhalat ommatun laAAanat okhtaha hatta itha iddarakoo feeha jameeAAan qalat okhrahum lioolahum rabbana haolai adalloona faatihim AAathaban diAAfan mina alnnari qala likullin diAAfun walakin la taAAlamoona
He will say: "Enter ye in the company of the peoples who passed away before you - men and jinns, - into the Fire." Every time a new people enters, it curses its sister-people (that went before), until they follow each other, all into the Fire. Saith the last about the first: "Our Lord! it is these that misled us: so give them a double penalty in the Fire." He will say: "Doubled for all": but this ye do not understand.
