For Marriage
They will not be a good spouse for you. Forget it.
For Business / Deal
They are lying to you and deceiving you. Do not proceed.
وَإِذْ أَخَذَ اللَّهُ مِيثَاقَ الَّذِينَ أُوتُوا الْكِتَابَ لَتُبَيِّنُنَّهُ لِلنَّاسِ وَلَا تَكْتُمُونَهُ فَنَبَذُوهُ وَرَاءَ ظُهُورِهِمْ وَاشْتَرَوْا بِهِ ثَمَنًا قَلِيلًا ۖ فَبِئْسَ مَا يَشْتَرُونَ
Waith akhatha Allahu meethaqa allatheena ootoo alkitaba latubayyinunnahu lilnnasi wala taktumoonahu fanabathoohu waraa thuhoorihim waishtaraw bihi thamanan qaleelan fabisa ma yashtaroona
And remember Allah took a covenant from the People of the Book, to make it known and clear to mankind, and not to hide it; but they threw it away behind their backs, and purchased with it some miserable gain! And vile was the bargain they made!
